Add latest changes from gitlab-org/gitlab@master

56 files changed, 939 insertions, 840 deletions

diff --git a/spec/factories/error_tracking/detailed_error.rb b/spec/factories/error_tracking/detailed_error.rb
index f12c327d403..b0114558bd4 100644
--- a/spec/factories/error_tracking/detailed_error.rb
+++ b/spec/factories/error_tracking/detailed_error.rb
@@ -18,6 +18,12 @@ FactoryBot.define do
     project_slug { 'project_name' }
     short_id { 'ID' }
     status { 'unresolved' }
+    tags do
+      {
+        level: 'error',
+        logger: 'rails'
+      }
+    end
     frequency do
       [
         [Time.now.to_i, 10]
diff --git a/spec/fixtures/api/schemas/error_tracking/error_detailed.json b/spec/fixtures/api/schemas/error_tracking/error_detailed.json
index 2a1cd2c03e0..9a6797bf3c7 100644
--- a/spec/fixtures/api/schemas/error_tracking/error_detailed.json
+++ b/spec/fixtures/api/schemas/error_tracking/error_detailed.json
@@ -5,6 +5,7 @@
     "external_base_url",
     "last_seen",
     "message",
+    "tags",
     "type",
     "title",
     "project_id",
@@ -20,23 +21,38 @@
     "last_release_short_version"
   ],
   "properties" : {
-    "id": { "type": "string"},
+    "id": { "type": "string" },
     "first_seen": { "type": "string", "format": "date-time" },
     "last_seen": { "type": "string", "format": "date-time" },
     "type": { "type": "string" },
     "message": { "type": "string" },
     "culprit": { "type": "string" },
-    "count": { "type": "integer"},
+    "count": { "type": "integer" },
     "external_url": { "type": "string" },
     "external_base_url": { "type": "string" },
     "user_count": { "type": "integer"},
-    "title": { "type": "string"},
-    "project_id": { "type": "string"},
-    "project_name": { "type": "string"},
-    "project_slug": { "type": "string"},
-    "short_id": { "type": "string"},
-    "status": { "type": "string"},
-    "frequency": { "type": "array"},
+    "tags": {
+      "type": "object",
+      "required" : [
+        "level",
+        "logger"
+      ],
+      "properties": {
+        "level": {
+          "type": "string"
+        },
+        "logger": {
+          "type": "string"
+        }
+      }
+    },
+    "title": { "type": "string" },
+    "project_id": { "type": "string" },
+    "project_name": { "type": "string" },
+    "project_slug": { "type": "string" },
+    "short_id": { "type": "string" },
+    "status": { "type": "string" },
+    "frequency": { "type": "array" },
     "gitlab_issue": { "type": ["string", "null"] },
     "first_release_last_commit": { "type": ["string", "null"] },
     "last_release_last_commit": { "type": ["string", "null"] },
diff --git a/spec/frontend/behaviors/bind_in_out_spec.js b/spec/frontend/behaviors/bind_in_out_spec.js
new file mode 100644
index 00000000000..923b6d372dd
--- /dev/null
+++ b/spec/frontend/behaviors/bind_in_out_spec.js
@@ -0,0 +1,204 @@
+import BindInOut from '~/behaviors/bind_in_out';
+import ClassSpecHelper from '../helpers/class_spec_helper';
+
+describe('BindInOut', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  describe('constructor', () => {
+    beforeEach(() => {
+      testContext.in = {};
+      testContext.out = {};
+
+      testContext.bindInOut = new BindInOut(testContext.in, testContext.out);
+    });
+
+    it('should set .in', () => {
+      expect(testContext.bindInOut.in).toBe(testContext.in);
+    });
+
+    it('should set .out', () => {
+      expect(testContext.bindInOut.out).toBe(testContext.out);
+    });
+
+    it('should set .eventWrapper', () => {
+      expect(testContext.bindInOut.eventWrapper).toEqual({});
+    });
+
+    describe('if .in is an input', () => {
+      beforeEach(() => {
+        testContext.bindInOut = new BindInOut({ tagName: 'INPUT' });
+      });
+
+      it('should set .eventType to keyup ', () => {
+        expect(testContext.bindInOut.eventType).toEqual('keyup');
+      });
+    });
+
+    describe('if .in is a textarea', () => {
+      beforeEach(() => {
+        testContext.bindInOut = new BindInOut({ tagName: 'TEXTAREA' });
+      });
+
+      it('should set .eventType to keyup ', () => {
+        expect(testContext.bindInOut.eventType).toEqual('keyup');
+      });
+    });
+
+    describe('if .in is not an input or textarea', () => {
+      beforeEach(() => {
+        testContext.bindInOut = new BindInOut({ tagName: 'SELECT' });
+      });
+
+      it('should set .eventType to change ', () => {
+        expect(testContext.bindInOut.eventType).toEqual('change');
+      });
+    });
+  });
+
+  describe('addEvents', () => {
+    beforeEach(() => {
+      testContext.in = {
+        addEventListener: jest.fn(),
+      };
+
+      testContext.bindInOut = new BindInOut(testContext.in);
+
+      testContext.addEvents = testContext.bindInOut.addEvents();
+    });
+
+    it('should set .eventWrapper.updateOut', () => {
+      expect(testContext.bindInOut.eventWrapper.updateOut).toEqual(expect.any(Function));
+    });
+
+    it('should call .addEventListener', () => {
+      expect(testContext.in.addEventListener).toHaveBeenCalledWith(
+        testContext.bindInOut.eventType,
+        testContext.bindInOut.eventWrapper.updateOut,
+      );
+    });
+
+    it('should return the instance', () => {
+      expect(testContext.addEvents).toBe(testContext.bindInOut);
+    });
+  });
+
+  describe('updateOut', () => {
+    beforeEach(() => {
+      testContext.in = { value: 'the-value' };
+      testContext.out = { textContent: 'not-the-value' };
+
+      testContext.bindInOut = new BindInOut(testContext.in, testContext.out);
+
+      testContext.updateOut = testContext.bindInOut.updateOut();
+    });
+
+    it('should set .out.textContent to .in.value', () => {
+      expect(testContext.out.textContent).toBe(testContext.in.value);
+    });
+
+    it('should return the instance', () => {
+      expect(testContext.updateOut).toBe(testContext.bindInOut);
+    });
+  });
+
+  describe('removeEvents', () => {
+    beforeEach(() => {
+      testContext.in = {
+        removeEventListener: jest.fn(),
+      };
+      testContext.updateOut = () => {};
+
+      testContext.bindInOut = new BindInOut(testContext.in);
+      testContext.bindInOut.eventWrapper.updateOut = testContext.updateOut;
+
+      testContext.removeEvents = testContext.bindInOut.removeEvents();
+    });
+
+    it('should call .removeEventListener', () => {
+      expect(testContext.in.removeEventListener).toHaveBeenCalledWith(
+        testContext.bindInOut.eventType,
+        testContext.updateOut,
+      );
+    });
+
+    it('should return the instance', () => {
+      expect(testContext.removeEvents).toBe(testContext.bindInOut);
+    });
+  });
+
+  describe('initAll', () => {
+    beforeEach(() => {
+      testContext.ins = [0, 1, 2];
+      testContext.instances = [];
+
+      jest.spyOn(document, 'querySelectorAll').mockReturnValue(testContext.ins);
+      jest.spyOn(Array.prototype, 'map');
+      jest.spyOn(BindInOut, 'init').mockImplementation(() => {});
+
+      testContext.initAll = BindInOut.initAll();
+    });
+
+    ClassSpecHelper.itShouldBeAStaticMethod(BindInOut, 'initAll');
+
+    it('should call .querySelectorAll', () => {
+      expect(document.querySelectorAll).toHaveBeenCalledWith('*[data-bind-in]');
+    });
+
+    it('should call .map', () => {
+      expect(Array.prototype.map).toHaveBeenCalledWith(expect.any(Function));
+    });
+
+    it('should call .init for each element', () => {
+      expect(BindInOut.init.mock.calls.length).toEqual(3);
+    });
+
+    it('should return an array of instances', () => {
+      expect(testContext.initAll).toEqual(expect.any(Array));
+    });
+  });
+
+  describe('init', () => {
+    beforeEach(() => {
+      // eslint-disable-next-line func-names
+      jest.spyOn(BindInOut.prototype, 'addEvents').mockImplementation(function() {
+        return this;
+      });
+      // eslint-disable-next-line func-names
+      jest.spyOn(BindInOut.prototype, 'updateOut').mockImplementation(function() {
+        return this;
+      });
+
+      testContext.init = BindInOut.init({}, {});
+    });
+
+    ClassSpecHelper.itShouldBeAStaticMethod(BindInOut, 'init');
+
+    it('should call .addEvents', () => {
+      expect(BindInOut.prototype.addEvents).toHaveBeenCalled();
+    });
+
+    it('should call .updateOut', () => {
+      expect(BindInOut.prototype.updateOut).toHaveBeenCalled();
+    });
+
+    describe('if no anOut is provided', () => {
+      beforeEach(() => {
+        testContext.anIn = { dataset: { bindIn: 'the-data-bind-in' } };
+
+        jest.spyOn(document, 'querySelector').mockImplementation(() => {});
+
+        BindInOut.init(testContext.anIn);
+      });
+
+      it('should call .querySelector', () => {
+        expect(document.querySelector).toHaveBeenCalledWith(
+          `*[data-bind-out="${testContext.anIn.dataset.bindIn}"]`,
+        );
+      });
+    });
+  });
+});
diff --git a/spec/javascripts/bootstrap_jquery_spec.js b/spec/frontend/bootstrap_jquery_spec.js
index 6957cf40301..d5d592e3839 100644
--- a/spec/javascripts/bootstrap_jquery_spec.js
+++ b/spec/frontend/bootstrap_jquery_spec.js
@@ -1,37 +1,40 @@
 import $ from 'jquery';
 import '~/commons/bootstrap';
 
-describe('Bootstrap jQuery extensions', function() {
-  describe('disable', function() {
-    beforeEach(function() {
-      return setFixtures('<input type="text" />');
+describe('Bootstrap jQuery extensions', () => {
+  describe('disable', () => {
+    beforeEach(() => {
+      setFixtures('<input type="text" />');
     });
 
-    it('adds the disabled attribute', function() {
+    it('adds the disabled attribute', () => {
       const $input = $('input').first();
       $input.disable();
 
       expect($input).toHaveAttr('disabled', 'disabled');
     });
-    return it('adds the disabled class', function() {
+
+    it('adds the disabled class', () => {
       const $input = $('input').first();
       $input.disable();
 
       expect($input).toHaveClass('disabled');
     });
   });
-  return describe('enable', function() {
-    beforeEach(function() {
-      return setFixtures('<input type="text" disabled="disabled" class="disabled" />');
+
+  describe('enable', () => {
+    beforeEach(() => {
+      setFixtures('<input type="text" disabled="disabled" class="disabled" />');
     });
 
-    it('removes the disabled attribute', function() {
+    it('removes the disabled attribute', () => {
       const $input = $('input').first();
       $input.enable();
 
       expect($input).not.toHaveAttr('disabled');
     });
-    return it('removes the disabled class', function() {
+
+    it('removes the disabled class', () => {
       const $input = $('input').first();
       $input.enable();
 
diff --git a/spec/javascripts/branches/branches_delete_modal_spec.js b/spec/frontend/branches/branches_delete_modal_spec.js
index b223b8e2c0a..21608feafc8 100644
--- a/spec/javascripts/branches/branches_delete_modal_spec.js
+++ b/spec/frontend/branches/branches_delete_modal_spec.js
@@ -15,7 +15,7 @@ describe('branches delete modal', () => {
         </div>
       `);
       $deleteButton = $('.js-delete-branch');
-      submitSpy = jasmine.createSpy('submit').and.callFake(event => event.preventDefault());
+      submitSpy = jest.fn(event => event.preventDefault());
       $('#modal-delete-branch form').on('submit', submitSpy);
       // eslint-disable-next-line no-new
       new DeleteModal();
diff --git a/spec/javascripts/breakpoints_spec.js b/spec/frontend/breakpoints_spec.js
index fc0d9eb907a..c9014ddd3e2 100644
--- a/spec/javascripts/breakpoints_spec.js
+++ b/spec/frontend/breakpoints_spec.js
@@ -5,7 +5,7 @@ describe('breakpoints', () => {
     const size = breakpoints[key];
 
     it(`returns ${key} when larger than ${size}`, () => {
-      spyOn(bp, 'windowWidth').and.returnValue(size + 10);
+      jest.spyOn(bp, 'windowWidth').mockReturnValue(size + 10);
 
       expect(bp.getBreakpointSize()).toBe(key);
     });
@@ -13,13 +13,13 @@ describe('breakpoints', () => {
 
   describe('isDesktop', () => {
     it('returns true when screen size is medium', () => {
-      spyOn(bp, 'windowWidth').and.returnValue(breakpoints.md + 10);
+      jest.spyOn(bp, 'windowWidth').mockReturnValue(breakpoints.md + 10);
 
       expect(bp.isDesktop()).toBe(true);
     });
 
     it('returns false when screen size is small', () => {
-      spyOn(bp, 'windowWidth').and.returnValue(breakpoints.sm + 10);
+      jest.spyOn(bp, 'windowWidth').mockReturnValue(breakpoints.sm + 10);
 
       expect(bp.isDesktop()).toBe(false);
     });
diff --git a/spec/javascripts/diffs/components/settings_dropdown_spec.js b/spec/frontend/diffs/components/settings_dropdown_spec.js
index 6c08474ffd2..c360f5584ca 100644
--- a/spec/javascripts/diffs/components/settings_dropdown_spec.js
+++ b/spec/frontend/diffs/components/settings_dropdown_spec.js
@@ -34,10 +34,10 @@ describe('Diff settiings dropdown component', () => {
 
   beforeEach(() => {
     actions = {
-      setInlineDiffViewType: jasmine.createSpy('setInlineDiffViewType'),
-      setParallelDiffViewType: jasmine.createSpy('setParallelDiffViewType'),
-      setRenderTreeList: jasmine.createSpy('setRenderTreeList'),
-      setShowWhitespace: jasmine.createSpy('setShowWhitespace'),
+      setInlineDiffViewType: jest.fn(),
+      setParallelDiffViewType: jest.fn(),
+      setRenderTreeList: jest.fn(),
+      setShowWhitespace: jest.fn(),
     };
   });
 
@@ -51,7 +51,7 @@ describe('Diff settiings dropdown component', () => {
 
       vm.find('.js-list-view').trigger('click');
 
-      expect(actions.setRenderTreeList).toHaveBeenCalledWith(jasmine.anything(), false, undefined);
+      expect(actions.setRenderTreeList).toHaveBeenCalledWith(expect.anything(), false, undefined);
     });
 
     it('tree view button dispatches setRenderTreeList with true', () => {
@@ -59,7 +59,7 @@ describe('Diff settiings dropdown component', () => {
 
       vm.find('.js-tree-view').trigger('click');
 
-      expect(actions.setRenderTreeList).toHaveBeenCalledWith(jasmine.anything(), true, undefined);
+      expect(actions.setRenderTreeList).toHaveBeenCalledWith(expect.anything(), true, undefined);
     });
 
     it('sets list button as active when renderTreeList is false', () => {
@@ -155,7 +155,7 @@ describe('Diff settiings dropdown component', () => {
       checkbox.trigger('change');
 
       expect(actions.setShowWhitespace).toHaveBeenCalledWith(
-        jasmine.anything(),
+        expect.anything(),
         {
           showWhitespace: true,
           pushState: true,
diff --git a/spec/frontend/droplab/constants_spec.js b/spec/frontend/droplab/constants_spec.js
new file mode 100644
index 00000000000..fd48228d6a2
--- /dev/null
+++ b/spec/frontend/droplab/constants_spec.js
@@ -0,0 +1,39 @@
+import * as constants from '~/droplab/constants';
+
+describe('constants', () => {
+  describe('DATA_TRIGGER', () => {
+    it('should be `data-dropdown-trigger`', () => {
+      expect(constants.DATA_TRIGGER).toBe('data-dropdown-trigger');
+    });
+  });
+
+  describe('DATA_DROPDOWN', () => {
+    it('should be `data-dropdown`', () => {
+      expect(constants.DATA_DROPDOWN).toBe('data-dropdown');
+    });
+  });
+
+  describe('SELECTED_CLASS', () => {
+    it('should be `droplab-item-selected`', () => {
+      expect(constants.SELECTED_CLASS).toBe('droplab-item-selected');
+    });
+  });
+
+  describe('ACTIVE_CLASS', () => {
+    it('should be `droplab-item-active`', () => {
+      expect(constants.ACTIVE_CLASS).toBe('droplab-item-active');
+    });
+  });
+
+  describe('TEMPLATE_REGEX', () => {
+    it('should be a handlebars templating syntax regex', () => {
+      expect(constants.TEMPLATE_REGEX).toEqual(/\{\{(.+?)\}\}/g);
+    });
+  });
+
+  describe('IGNORE_CLASS', () => {
+    it('should be `droplab-item-ignore`', () => {
+      expect(constants.IGNORE_CLASS).toBe('droplab-item-ignore');
+    });
+  });
+});
diff --git a/spec/javascripts/droplab/plugins/ajax_filter_spec.js b/spec/frontend/droplab/plugins/ajax_filter_spec.js
index 5dbe50af07f..5ec0400cbc5 100644
--- a/spec/javascripts/droplab/plugins/ajax_filter_spec.js
+++ b/spec/frontend/droplab/plugins/ajax_filter_spec.js
@@ -28,10 +28,10 @@ describe('AjaxFilter', () => {
     let ajaxSpy;
 
     beforeEach(() => {
-      spyOn(AjaxCache, 'retrieve').and.callFake(url => ajaxSpy(url));
-      spyOn(AjaxFilter, '_loadData');
+      jest.spyOn(AjaxCache, 'retrieve').mockImplementation(url => ajaxSpy(url));
+      jest.spyOn(AjaxFilter, '_loadData').mockImplementation(() => {});
 
-      dummyConfig.onLoadingFinished = jasmine.createSpy('spy');
+      dummyConfig.onLoadingFinished = jest.fn();
 
       const dynamicList = document.createElement('div');
       dynamicList.dataset.dynamic = true;
@@ -46,7 +46,7 @@ describe('AjaxFilter', () => {
 
       AjaxFilter.trigger()
         .then(() => {
-          expect(dummyConfig.onLoadingFinished.calls.count()).toBe(1);
+          expect(dummyConfig.onLoadingFinished.mock.calls.length).toBe(1);
         })
         .then(done)
         .catch(done.fail);
@@ -63,7 +63,7 @@ describe('AjaxFilter', () => {
         .then(done.fail)
         .catch(error => {
           expect(error).toBe(dummyError);
-          expect(dummyConfig.onLoadingFinished.calls.count()).toBe(0);
+          expect(dummyConfig.onLoadingFinished.mock.calls.length).toBe(0);
         })
         .then(done)
         .catch(done.fail);
diff --git a/spec/javascripts/droplab/plugins/ajax_spec.js b/spec/frontend/droplab/plugins/ajax_spec.js
index 2f492d00c0a..1d7576ce420 100644
--- a/spec/javascripts/droplab/plugins/ajax_spec.js
+++ b/spec/frontend/droplab/plugins/ajax_spec.js
@@ -18,23 +18,23 @@ describe('Ajax', () => {
 
       beforeEach(() => {
         config.preprocessing = () => processedArray;
-        spyOn(config, 'preprocessing').and.callFake(() => processedArray);
+        jest.spyOn(config, 'preprocessing').mockImplementation(() => processedArray);
       });
 
       it('calls preprocessing', () => {
         Ajax.preprocessing(config, []);
 
-        expect(config.preprocessing.calls.count()).toBe(1);
+        expect(config.preprocessing.mock.calls.length).toBe(1);
       });
 
       it('overrides AjaxCache', () => {
-        spyOn(AjaxCache, 'override').and.callFake((endpoint, results) => {
+        jest.spyOn(AjaxCache, 'override').mockImplementation((endpoint, results) => {
           expect(results).toEqual(processedArray);
         });
 
         Ajax.preprocessing(config, []);
 
-        expect(AjaxCache.override.calls.count()).toBe(1);
+        expect(AjaxCache.override.mock.calls.length).toBe(1);
       });
     });
   });
diff --git a/spec/javascripts/feature_highlight/feature_highlight_options_spec.js b/spec/frontend/feature_highlight/feature_highlight_options_spec.js
index 7f9425d8abe..cd41d1ed091 100644
--- a/spec/javascripts/feature_highlight/feature_highlight_options_spec.js
+++ b/spec/frontend/feature_highlight/feature_highlight_options_spec.js
@@ -4,25 +4,25 @@ import bp from '~/breakpoints';
 describe('feature highlight options', () => {
   describe('domContentLoaded', () => {
     it('should not call highlightFeatures when breakpoint is xs', () => {
-      spyOn(bp, 'getBreakpointSize').and.returnValue('xs');
+      jest.spyOn(bp, 'getBreakpointSize').mockReturnValue('xs');
 
       expect(domContentLoaded()).toBe(false);
     });
 
     it('should not call highlightFeatures when breakpoint is sm', () => {
-      spyOn(bp, 'getBreakpointSize').and.returnValue('sm');
+      jest.spyOn(bp, 'getBreakpointSize').mockReturnValue('sm');
 
       expect(domContentLoaded()).toBe(false);
     });
 
     it('should not call highlightFeatures when breakpoint is md', () => {
-      spyOn(bp, 'getBreakpointSize').and.returnValue('md');
+      jest.spyOn(bp, 'getBreakpointSize').mockReturnValue('md');
 
       expect(domContentLoaded()).toBe(false);
     });
 
     it('should call highlightFeatures when breakpoint is lg', () => {
-      spyOn(bp, 'getBreakpointSize').and.returnValue('lg');
+      jest.spyOn(bp, 'getBreakpointSize').mockReturnValue('lg');
 
       expect(domContentLoaded()).toBe(true);
     });
diff --git a/spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js b/spec/frontend/filtered_search/components/recent_searches_dropdown_content_spec.js
index d1742dcedfa..2543fb8768b 100644
--- a/spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js
+++ b/spec/frontend/filtered_search/components/recent_searches_dropdown_content_spec.js
@@ -158,7 +158,7 @@ describe('RecentSearchesDropdownContent', () => {
       let onRecentSearchesItemSelectedSpy;
 
       beforeEach(() => {
-        onRecentSearchesItemSelectedSpy = jasmine.createSpy('spy');
+        onRecentSearchesItemSelectedSpy = jest.fn();
         eventHub.$on('recentSearchesItemSelected', onRecentSearchesItemSelectedSpy);
 
         vm = createComponent(propsDataWithItems);
@@ -180,7 +180,7 @@ describe('RecentSearchesDropdownContent', () => {
       let onRequestClearRecentSearchesSpy;
 
       beforeEach(() => {
-        onRequestClearRecentSearchesSpy = jasmine.createSpy('spy');
+        onRequestClearRecentSearchesSpy = jest.fn();
         eventHub.$on('requestClearRecentSearches', onRequestClearRecentSearchesSpy);
 
         vm = createComponent(propsDataWithItems);
diff --git a/spec/javascripts/filtered_search/dropdown_user_spec.js b/spec/frontend/filtered_search/dropdown_user_spec.js
index f764800fff0..8eef10290bf 100644
--- a/spec/javascripts/filtered_search/dropdown_user_spec.js
+++ b/spec/frontend/filtered_search/dropdown_user_spec.js
@@ -8,10 +8,10 @@ describe('Dropdown User', () => {
     let dropdownUser;
 
     beforeEach(() => {
-      spyOn(DropdownUser.prototype, 'bindEvents').and.callFake(() => {});
-      spyOn(DropdownUser.prototype, 'getProjectId').and.callFake(() => {});
-      spyOn(DropdownUser.prototype, 'getGroupId').and.callFake(() => {});
-      spyOn(DropdownUtils, 'getSearchInput').and.callFake(() => {});
+      jest.spyOn(DropdownUser.prototype, 'bindEvents').mockImplementation(() => {});
+      jest.spyOn(DropdownUser.prototype, 'getProjectId').mockImplementation(() => {});
+      jest.spyOn(DropdownUser.prototype, 'getGroupId').mockImplementation(() => {});
+      jest.spyOn(DropdownUtils, 'getSearchInput').mockImplementation(() => {});
 
       dropdownUser = new DropdownUser({
         tokenKeys: IssuableFilteredTokenKeys,
@@ -19,7 +19,7 @@ describe('Dropdown User', () => {
     });
 
     it('should not return the double quote found in value', () => {
-      spyOn(FilteredSearchTokenizer, 'processTokens').and.returnValue({
+      jest.spyOn(FilteredSearchTokenizer, 'processTokens').mockReturnValue({
         lastToken: '"johnny appleseed',
       });
 
@@ -27,7 +27,7 @@ describe('Dropdown User', () => {
     });
 
     it('should not return the single quote found in value', () => {
-      spyOn(FilteredSearchTokenizer, 'processTokens').and.returnValue({
+      jest.spyOn(FilteredSearchTokenizer, 'processTokens').mockReturnValue({
         lastToken: "'larry boy",
       });
 
@@ -37,9 +37,9 @@ describe('Dropdown User', () => {
 
   describe("config AjaxFilter's endpoint", () => {
     beforeEach(() => {
-      spyOn(DropdownUser.prototype, 'bindEvents').and.callFake(() => {});
-      spyOn(DropdownUser.prototype, 'getProjectId').and.callFake(() => {});
-      spyOn(DropdownUser.prototype, 'getGroupId').and.callFake(() => {});
+      jest.spyOn(DropdownUser.prototype, 'bindEvents').mockImplementation(() => {});
+      jest.spyOn(DropdownUser.prototype, 'getProjectId').mockImplementation(() => {});
+      jest.spyOn(DropdownUser.prototype, 'getGroupId').mockImplementation(() => {});
     });
 
     it('should return endpoint', () => {
diff --git a/spec/javascripts/frequent_items/components/frequent_items_search_input_spec.js b/spec/frontend/frequent_items/components/frequent_items_search_input_spec.js
index be11af8428f..e5f1ab21c7f 100644
--- a/spec/javascripts/frequent_items/components/frequent_items_search_input_spec.js
+++ b/spec/frontend/frequent_items/components/frequent_items_search_input_spec.js
@@ -28,7 +28,7 @@ describe('FrequentItemsSearchInputComponent', () => {
   describe('methods', () => {
     describe('setFocus', () => {
       it('should set focus to search input', () => {
-        spyOn(vm.$refs.search, 'focus');
+        jest.spyOn(vm.$refs.search, 'focus').mockImplementation(() => {});
 
         vm.setFocus();
 
@@ -39,13 +39,13 @@ describe('FrequentItemsSearchInputComponent', () => {
 
   describe('mounted', () => {
     it('should listen `dropdownOpen` event', done => {
-      spyOn(eventHub, '$on');
+      jest.spyOn(eventHub, '$on').mockImplementation(() => {});
       const vmX = createComponent().vm;
 
       localVue.nextTick(() => {
         expect(eventHub.$on).toHaveBeenCalledWith(
           `${vmX.namespace}-dropdownOpen`,
-          jasmine.any(Function),
+          expect.any(Function),
         );
         done();
       });
@@ -55,7 +55,7 @@ describe('FrequentItemsSearchInputComponent', () => {
   describe('beforeDestroy', () => {
     it('should unbind event listeners on eventHub', done => {
       const vmX = createComponent().vm;
-      spyOn(eventHub, '$off');
+      jest.spyOn(eventHub, '$off').mockImplementation(() => {});
 
       vmX.$mount();
       vmX.$destroy();
@@ -63,7 +63,7 @@ describe('FrequentItemsSearchInputComponent', () => {
       localVue.nextTick(() => {
         expect(eventHub.$off).toHaveBeenCalledWith(
           `${vmX.namespace}-dropdownOpen`,
-          jasmine.any(Function),
+          expect.any(Function),
         );
         done();
       });
diff --git a/spec/javascripts/gl_field_errors_spec.js b/spec/frontend/gl_field_errors_spec.js
index 294f219d6fe..4653f519f65 100644
--- a/spec/javascripts/gl_field_errors_spec.js
+++ b/spec/frontend/gl_field_errors_spec.js
@@ -3,83 +3,89 @@
 import $ from 'jquery';
 import GlFieldErrors from '~/gl_field_errors';
 
-describe('GL Style Field Errors', function() {
+describe('GL Style Field Errors', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
   preloadFixtures('static/gl_field_errors.html');
 
-  beforeEach(function() {
+  beforeEach(() => {
     loadFixtures('static/gl_field_errors.html');
     const $form = $('form.gl-show-field-errors');
 
-    this.$form = $form;
-    this.fieldErrors = new GlFieldErrors($form);
+    testContext.$form = $form;
+    testContext.fieldErrors = new GlFieldErrors($form);
   });
 
-  it('should select the correct input elements', function() {
-    expect(this.$form).toBeDefined();
-    expect(this.$form.length).toBe(1);
-    expect(this.fieldErrors).toBeDefined();
-    const { inputs } = this.fieldErrors.state;
+  it('should select the correct input elements', () => {
+    expect(testContext.$form).toBeDefined();
+    expect(testContext.$form.length).toBe(1);
+    expect(testContext.fieldErrors).toBeDefined();
+    const { inputs } = testContext.fieldErrors.state;
 
     expect(inputs.length).toBe(4);
   });
 
-  it('should ignore elements with custom error handling', function() {
+  it('should ignore elements with custom error handling', () => {
     const customErrorFlag = 'gl-field-error-ignore';
     const customErrorElem = $(`.${customErrorFlag}`);
 
     expect(customErrorElem.length).toBe(1);
 
-    const customErrors = this.fieldErrors.state.inputs.filter(input => {
+    const customErrors = testContext.fieldErrors.state.inputs.filter(input => {
       return input.inputElement.hasClass(customErrorFlag);
     });
 
     expect(customErrors.length).toBe(0);
   });
 
-  it('should not show any errors before submit attempt', function() {
-    this.$form
+  it('should not show any errors before submit attempt', () => {
+    testContext.$form
       .find('.email')
       .val('not-a-valid-email')
       .keyup();
-    this.$form
+    testContext.$form
       .find('.text-required')
       .val('')
       .keyup();
-    this.$form
+    testContext.$form
       .find('.alphanumberic')
       .val('?---*')
       .keyup();
 
-    const errorsShown = this.$form.find('.gl-field-error-outline');
+    const errorsShown = testContext.$form.find('.gl-field-error-outline');
 
     expect(errorsShown.length).toBe(0);
   });
 
-  it('should show errors when input valid is submitted', function() {
-    this.$form
+  it('should show errors when input valid is submitted', () => {
+    testContext.$form
       .find('.email')
       .val('not-a-valid-email')
       .keyup();
-    this.$form
+    testContext.$form
       .find('.text-required')
       .val('')
       .keyup();
-    this.$form
+    testContext.$form
       .find('.alphanumberic')
       .val('?---*')
       .keyup();
 
-    this.$form.submit();
+    testContext.$form.submit();
 
-    const errorsShown = this.$form.find('.gl-field-error-outline');
+    const errorsShown = testContext.$form.find('.gl-field-error-outline');
 
     expect(errorsShown.length).toBe(4);
   });
 
-  it('should properly track validity state on input after invalid submission attempt', function() {
-    this.$form.submit();
+  it('should properly track validity state on input after invalid submission attempt', () => {
+    testContext.$form.submit();
 
-    const emailInputModel = this.fieldErrors.state.inputs[1];
+    const emailInputModel = testContext.fieldErrors.state.inputs[1];
     const fieldState = emailInputModel.state;
     const emailInputElement = emailInputModel.inputElement;
 
@@ -124,9 +130,9 @@ describe('GL Style Field Errors', function() {
     expect(fieldState.valid).toBe(true);
   });
 
-  it('should properly infer error messages', function() {
-    this.$form.submit();
-    const trackedInputs = this.fieldErrors.state.inputs;
+  it('should properly infer error messages', () => {
+    testContext.$form.submit();
+    const trackedInputs = testContext.fieldErrors.state.inputs;
     const inputHasTitle = trackedInputs[1];
     const hasTitleErrorElem = inputHasTitle.inputElement.siblings('.gl-field-error');
     const inputNoTitle = trackedInputs[2];
diff --git a/spec/javascripts/gpg_badges_spec.js b/spec/frontend/gpg_badges_spec.js
index 4731484e02d..809cc5c88e2 100644
--- a/spec/javascripts/gpg_badges_spec.js
+++ b/spec/frontend/gpg_badges_spec.js
@@ -38,7 +38,7 @@ describe('GpgBadges', () => {
 
   it('does not make a request if there is no container element', done => {
     setFixtures('');
-    spyOn(axios, 'get');
+    jest.spyOn(axios, 'get').mockImplementation(() => {});
 
     GpgBadges.fetch()
       .then(() => {
@@ -50,7 +50,7 @@ describe('GpgBadges', () => {
 
   it('throws an error if the endpoint is missing', done => {
     setFixtures('<div class="js-signature-container"></div>');
-    spyOn(axios, 'get');
+    jest.spyOn(axios, 'get').mockImplementation(() => {});
 
     GpgBadges.fetch()
       .then(() => done.fail('Expected error to be thrown'))
diff --git a/spec/javascripts/header_spec.js b/spec/frontend/header_spec.js
index c36d3be1b22..00b5b306d66 100644
--- a/spec/javascripts/header_spec.js
+++ b/spec/frontend/header_spec.js
@@ -1,7 +1,7 @@
 import $ from 'jquery';
 import initTodoToggle from '~/header';
 
-describe('Header', function() {
+describe('Header', () => {
   const todosPendingCount = '.todos-count';
   const fixtureTemplate = 'issues/open-issue.html';
 
diff --git a/spec/javascripts/helpers/class_spec_helper_spec.js b/spec/frontend/helpers/class_spec_helper_spec.js
index f6268b0fb6d..533d5687bde 100644
--- a/spec/javascripts/helpers/class_spec_helper_spec.js
+++ b/spec/frontend/helpers/class_spec_helper_spec.js
@@ -2,7 +2,13 @@
 
 import './class_spec_helper';
 
-describe('ClassSpecHelper', function() {
+describe('ClassSpecHelper', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
   describe('itShouldBeAStaticMethod', () => {
     beforeEach(() => {
       class TestClass {
@@ -12,7 +18,7 @@ describe('ClassSpecHelper', function() {
         static staticMethod() {}
       }
 
-      this.TestClass = TestClass;
+      testContext.TestClass = TestClass;
     });
 
     ClassSpecHelper.itShouldBeAStaticMethod(ClassSpecHelper, 'itShouldBeAStaticMethod');
diff --git a/spec/javascripts/ide/components/commit_sidebar/stage_button_spec.js b/spec/frontend/ide/components/commit_sidebar/stage_button_spec.js
index e09ccbe2a63..b59de4dac0e 100644
--- a/spec/javascripts/ide/components/commit_sidebar/stage_button_spec.js
+++ b/spec/frontend/ide/components/commit_sidebar/stage_button_spec.js
@@ -16,8 +16,8 @@ describe('IDE stage file button', () => {
       path: f.path,
     });
 
-    spyOn(vm, 'stageChange');
-    spyOn(vm, 'discardFileChanges');
+    jest.spyOn(vm, 'stageChange').mockImplementation(() => {});
+    jest.spyOn(vm, 'discardFileChanges').mockImplementation(() => {});
 
     vm.$mount();
   });
diff --git a/spec/javascripts/ide/components/commit_sidebar/unstage_button_spec.js b/spec/frontend/ide/components/commit_sidebar/unstage_button_spec.js
index 917bbb9fb46..53b53c8c815 100644
--- a/spec/javascripts/ide/components/commit_sidebar/unstage_button_spec.js
+++ b/spec/frontend/ide/components/commit_sidebar/unstage_button_spec.js
@@ -16,7 +16,7 @@ describe('IDE unstage file button', () => {
       path: f.path,
     });
 
-    spyOn(vm, 'unstageChange');
+    jest.spyOn(vm, 'unstageChange').mockImplementation(() => {});
 
     vm.$mount();
   });
diff --git a/spec/javascripts/ide/components/jobs/detail/scroll_button_spec.js b/spec/frontend/ide/components/jobs/detail/scroll_button_spec.js
index fff382a107f..096851a5401 100644
--- a/spec/javascripts/ide/components/jobs/detail/scroll_button_spec.js
+++ b/spec/frontend/ide/components/jobs/detail/scroll_button_spec.js
@@ -40,7 +40,7 @@ describe('IDE job log scroll button', () => {
   });
 
   it('emits click event on click', () => {
-    spyOn(vm, '$emit');
+    jest.spyOn(vm, '$emit').mockImplementation(() => {});
 
     vm.$el.querySelector('.btn-scroll').click();
 
diff --git a/spec/javascripts/ide/stores/actions/file_spec.js b/spec/frontend/ide/stores/actions/file_spec.js
index 03d1125c23a..283ea266821 100644
--- a/spec/javascripts/ide/stores/actions/file_spec.js
+++ b/spec/frontend/ide/stores/actions/file_spec.js
@@ -24,7 +24,7 @@ describe('IDE store file actions', () => {
       relative_url_root: RELATIVE_URL_ROOT,
     };
 
-    spyOn(router, 'push');
+    jest.spyOn(router, 'push').mockImplementation(() => {});
   });
 
   afterEach(() => {
@@ -117,7 +117,7 @@ describe('IDE store file actions', () => {
     let oldScrollToTab;
 
     beforeEach(() => {
-      scrollToTabSpy = jasmine.createSpy('scrollToTab');
+      scrollToTabSpy = jest.fn();
       oldScrollToTab = store._actions.scrollToTab; // eslint-disable-line
       store._actions.scrollToTab = [scrollToTabSpy]; // eslint-disable-line
 
@@ -131,7 +131,7 @@ describe('IDE store file actions', () => {
     });
 
     it('calls scrollToTab', () => {
-      const dispatch = jasmine.createSpy();
+      const dispatch = jest.fn();
 
       actions.setFileActive(
         { commit() {}, state: store.state, getters: store.getters, dispatch },
@@ -142,7 +142,7 @@ describe('IDE store file actions', () => {
     });
 
     it('commits SET_FILE_ACTIVE', () => {
-      const commit = jasmine.createSpy();
+      const commit = jest.fn();
 
       actions.setFileActive(
         { commit, state: store.state, getters: store.getters, dispatch() {} },
@@ -161,7 +161,7 @@ describe('IDE store file actions', () => {
       localFile.active = true;
       store.state.openFiles.push(localFile);
 
-      const commit = jasmine.createSpy();
+      const commit = jest.fn();
 
       actions.setFileActive(
         { commit, state: store.state, getters: store.getters, dispatch() {} },
@@ -179,7 +179,7 @@ describe('IDE store file actions', () => {
     let localFile;
 
     beforeEach(() => {
-      spyOn(service, 'getFileData').and.callThrough();
+      jest.spyOn(service, 'getFileData');
 
       localFile = file(`newCreate-${Math.random()}`);
       store.state.entries[localFile.path] = localFile;
@@ -329,7 +329,7 @@ describe('IDE store file actions', () => {
       });
 
       it('dispatches error action', done => {
-        const dispatch = jasmine.createSpy('dispatch');
+        const dispatch = jest.fn();
 
         actions
           .getFileData(
@@ -339,7 +339,7 @@ describe('IDE store file actions', () => {
           .then(() => {
             expect(dispatch).toHaveBeenCalledWith('setErrorMessage', {
               text: 'An error occurred whilst loading the file.',
-              action: jasmine.any(Function),
+              action: expect.any(Function),
               actionText: 'Please try again',
               actionPayload: {
                 path: localFile.path,
@@ -358,7 +358,7 @@ describe('IDE store file actions', () => {
     let tmpFile;
 
     beforeEach(() => {
-      spyOn(service, 'getRawFileData').and.callThrough();
+      jest.spyOn(service, 'getRawFileData');
 
       tmpFile = file('tmpFile');
       store.state.entries[tmpFile.path] = tmpFile;
@@ -392,7 +392,7 @@ describe('IDE store file actions', () => {
       });
 
       it('calls also getBaseRawFileData service method', done => {
-        spyOn(service, 'getBaseRawFileData').and.returnValue(Promise.resolve('baseraw'));
+        jest.spyOn(service, 'getBaseRawFileData').mockReturnValue(Promise.resolve('baseraw'));
 
         store.state.currentProjectId = 'gitlab-org/gitlab-ce';
         store.state.currentMergeRequestId = '1';
@@ -443,7 +443,7 @@ describe('IDE store file actions', () => {
       });
 
       it('dispatches error action', done => {
-        const dispatch = jasmine.createSpy('dispatch');
+        const dispatch = jest.fn();
 
         actions
           .getRawFileData({ state: store.state, commit() {}, dispatch }, { path: tmpFile.path })
@@ -451,7 +451,7 @@ describe('IDE store file actions', () => {
           .catch(() => {
             expect(dispatch).toHaveBeenCalledWith('setErrorMessage', {
               text: 'An error occurred whilst loading the file content.',
-              action: jasmine.any(Function),
+              action: expect.any(Function),
               actionText: 'Please try again',
               actionPayload: {
                 path: tmpFile.path,
@@ -575,8 +575,8 @@ describe('IDE store file actions', () => {
     let tmpFile;
 
     beforeEach(() => {
-      spyOn(eventHub, '$on');
-      spyOn(eventHub, '$emit');
+      jest.spyOn(eventHub, '$on').mockImplementation(() => {});
+      jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
 
       tmpFile = file();
       tmpFile.content = 'testing';
@@ -756,7 +756,7 @@ describe('IDE store file actions', () => {
     let f;
 
     beforeEach(() => {
-      spyOn(eventHub, '$emit');
+      jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
 
       f = {
         ...file('pendingFile'),
@@ -789,7 +789,7 @@ describe('IDE store file actions', () => {
 
   describe('triggerFilesChange', () => {
     beforeEach(() => {
-      spyOn(eventHub, '$emit');
+      jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
     });
 
     it('emits event that files have changed', done => {
diff --git a/spec/javascripts/image_diff/helpers/init_image_diff_spec.js b/spec/frontend/image_diff/helpers/init_image_diff_spec.js
index ba501d58965..dc872ace265 100644
--- a/spec/javascripts/image_diff/helpers/init_image_diff_spec.js
+++ b/spec/frontend/image_diff/helpers/init_image_diff_spec.js
@@ -14,8 +14,8 @@ describe('initImageDiff', () => {
         <div class="diff-file"></div>
       `;
 
-    spyOn(ReplacedImageDiff.prototype, 'init').and.callFake(() => {});
-    spyOn(ImageDiff.prototype, 'init').and.callFake(() => {});
+    jest.spyOn(ReplacedImageDiff.prototype, 'init').mockImplementation(() => {});
+    jest.spyOn(ImageDiff.prototype, 'init').mockImplementation(() => {});
   });
 
   afterEach(() => {
diff --git a/spec/javascripts/image_diff/init_discussion_tab_spec.js b/spec/frontend/image_diff/init_discussion_tab_spec.js
index 5eb87e1df25..f459fdf5a08 100644
--- a/spec/javascripts/image_diff/init_discussion_tab_spec.js
+++ b/spec/frontend/image_diff/init_discussion_tab_spec.js
@@ -12,29 +12,31 @@ describe('initDiscussionTab', () => {
   });
 
   it('should pass canCreateNote as false to initImageDiff', done => {
-    spyOn(initImageDiffHelper, 'initImageDiff').and.callFake((diffFileEl, canCreateNote) => {
-      expect(canCreateNote).toEqual(false);
-      done();
-    });
+    jest
+      .spyOn(initImageDiffHelper, 'initImageDiff')
+      .mockImplementation((diffFileEl, canCreateNote) => {
+        expect(canCreateNote).toEqual(false);
+        done();
+      });
 
     initDiscussionTab();
   });
 
   it('should pass renderCommentBadge as true to initImageDiff', done => {
-    spyOn(initImageDiffHelper, 'initImageDiff').and.callFake(
-      (diffFileEl, canCreateNote, renderCommentBadge) => {
+    jest
+      .spyOn(initImageDiffHelper, 'initImageDiff')
+      .mockImplementation((diffFileEl, canCreateNote, renderCommentBadge) => {
         expect(renderCommentBadge).toEqual(true);
         done();
-      },
-    );
+      });
 
     initDiscussionTab();
   });
 
   it('should call initImageDiff for each diffFileEls', () => {
-    spyOn(initImageDiffHelper, 'initImageDiff').and.callFake(() => {});
+    jest.spyOn(initImageDiffHelper, 'initImageDiff').mockImplementation(() => {});
     initDiscussionTab();
 
-    expect(initImageDiffHelper.initImageDiff.calls.count()).toEqual(2);
+    expect(initImageDiffHelper.initImageDiff.mock.calls.length).toEqual(2);
   });
 });
diff --git a/spec/javascripts/issue_show/components/edit_actions_spec.js b/spec/frontend/issue_show/components/edit_actions_spec.js
index 2ab74ae4e10..b0c1894058e 100644
--- a/spec/javascripts/issue_show/components/edit_actions_spec.js
+++ b/spec/frontend/issue_show/components/edit_actions_spec.js
@@ -15,7 +15,7 @@ describe('Edit Actions components', () => {
     });
     store.formState.title = 'test';
 
-    spyOn(eventHub, '$emit');
+    jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
 
     vm = new Component({
       propsData: {
@@ -101,14 +101,14 @@ describe('Edit Actions components', () => {
 
   describe('deleteIssuable', () => {
     it('sends delete.issuable event when clicking save button', () => {
-      spyOn(window, 'confirm').and.returnValue(true);
+      jest.spyOn(window, 'confirm').mockReturnValue(true);
       vm.$el.querySelector('.btn-danger').click();
 
       expect(eventHub.$emit).toHaveBeenCalledWith('delete.issuable', { destroy_confirm: true });
     });
 
     it('shows loading icon after clicking delete button', done => {
-      spyOn(window, 'confirm').and.returnValue(true);
+      jest.spyOn(window, 'confirm').mockReturnValue(true);
       vm.$el.querySelector('.btn-danger').click();
 
       Vue.nextTick(() => {
@@ -119,7 +119,7 @@ describe('Edit Actions components', () => {
     });
 
     it('does no actions when confirm is false', done => {
-      spyOn(window, 'confirm').and.returnValue(false);
+      jest.spyOn(window, 'confirm').mockReturnValue(false);
       vm.$el.querySelector('.btn-danger').click();
 
       Vue.nextTick(() => {
diff --git a/spec/javascripts/issue_show/components/fields/description_spec.js b/spec/frontend/issue_show/components/fields/description_spec.js
index f5f87a6bfbf..8ea326ad1ee 100644
--- a/spec/javascripts/issue_show/components/fields/description_spec.js
+++ b/spec/frontend/issue_show/components/fields/description_spec.js
@@ -20,7 +20,7 @@ describe('Description field component', () => {
 
     document.body.appendChild(el);
 
-    spyOn(eventHub, '$emit');
+    jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
 
     vm = new Component({
       el,
diff --git a/spec/javascripts/issue_show/components/fields/title_spec.js b/spec/frontend/issue_show/components/fields/title_spec.js
index 62dff983250..99e8658b89f 100644
--- a/spec/javascripts/issue_show/components/fields/title_spec.js
+++ b/spec/frontend/issue_show/components/fields/title_spec.js
@@ -17,7 +17,7 @@ describe('Title field component', () => {
     });
     store.formState.title = 'test';
 
-    spyOn(eventHub, '$emit');
+    jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
 
     vm = new Component({
       propsData: {
diff --git a/spec/javascripts/issue_show/index_spec.js b/spec/frontend/issue_show/index_spec.js
index fa0b426c06c..e80d1b83c11 100644
--- a/spec/javascripts/issue_show/index_spec.js
+++ b/spec/frontend/issue_show/index_spec.js
@@ -10,7 +10,7 @@ describe('Issue show index', () => {
       });
       document.body.appendChild(d);
 
-      const alertSpy = spyOn(window, 'alert');
+      const alertSpy = jest.spyOn(window, 'alert');
       initIssueableApp();
 
       expect(alertSpy).not.toHaveBeenCalled();
diff --git a/spec/javascripts/jobs/components/job_log_controllers_spec.js b/spec/frontend/jobs/components/job_log_controllers_spec.js
index d527c6708fc..04f20811601 100644
--- a/spec/javascripts/jobs/components/job_log_controllers_spec.js
+++ b/spec/frontend/jobs/components/job_log_controllers_spec.js
@@ -100,7 +100,7 @@ describe('Job log controllers', () => {
         });
 
         it('emits scrollJobLogTop event on click', () => {
-          spyOn(vm, '$emit');
+          jest.spyOn(vm, '$emit').mockImplementation(() => {});
           vm.$el.querySelector('.js-scroll-top').click();
 
           expect(vm.$emit).toHaveBeenCalledWith('scrollJobLogTop');
@@ -127,7 +127,7 @@ describe('Job log controllers', () => {
         });
 
         it('does not emit scrollJobLogTop event on click', () => {
-          spyOn(vm, '$emit');
+          jest.spyOn(vm, '$emit').mockImplementation(() => {});
           vm.$el.querySelector('.js-scroll-top').click();
 
           expect(vm.$emit).not.toHaveBeenCalledWith('scrollJobLogTop');
@@ -146,7 +146,7 @@ describe('Job log controllers', () => {
         });
 
         it('emits scrollJobLogBottom event on click', () => {
-          spyOn(vm, '$emit');
+          jest.spyOn(vm, '$emit').mockImplementation(() => {});
           vm.$el.querySelector('.js-scroll-bottom').click();
 
           expect(vm.$emit).toHaveBeenCalledWith('scrollJobLogBottom');
@@ -173,7 +173,7 @@ describe('Job log controllers', () => {
         });
 
         it('does not emit scrollJobLogBottom event on click', () => {
-          spyOn(vm, '$emit');
+          jest.spyOn(vm, '$emit').mockImplementation(() => {});
           vm.$el.querySelector('.js-scroll-bottom').click();
 
           expect(vm.$emit).not.toHaveBeenCalledWith('scrollJobLogBottom');
diff --git a/spec/javascripts/namespace_select_spec.js b/spec/frontend/namespace_select_spec.js
index 07b82ce721e..399fa950769 100644
--- a/spec/javascripts/namespace_select_spec.js
+++ b/spec/frontend/namespace_select_spec.js
@@ -3,7 +3,7 @@ import NamespaceSelect from '~/namespace_select';
 
 describe('NamespaceSelect', () => {
   beforeEach(() => {
-    spyOn($.fn, 'glDropdown');
+    jest.spyOn($.fn, 'glDropdown').mockImplementation(() => {});
   });
 
   it('initializes glDropdown', () => {
@@ -22,12 +22,12 @@ describe('NamespaceSelect', () => {
       const dropdown = document.createElement('div');
       // eslint-disable-next-line no-new
       new NamespaceSelect({ dropdown });
-      [glDropdownOptions] = $.fn.glDropdown.calls.argsFor(0);
+      [[glDropdownOptions]] = $.fn.glDropdown.mock.calls;
     });
 
     it('prevents click events', () => {
       const dummyEvent = new Event('dummy');
-      spyOn(dummyEvent, 'preventDefault');
+      jest.spyOn(dummyEvent, 'preventDefault').mockImplementation(() => {});
 
       glDropdownOptions.clicked({ e: dummyEvent });
 
@@ -43,12 +43,12 @@ describe('NamespaceSelect', () => {
       dropdown.dataset.isFilter = 'true';
       // eslint-disable-next-line no-new
       new NamespaceSelect({ dropdown });
-      [glDropdownOptions] = $.fn.glDropdown.calls.argsFor(0);
+      [[glDropdownOptions]] = $.fn.glDropdown.mock.calls;
     });
 
     it('does not prevent click events', () => {
       const dummyEvent = new Event('dummy');
-      spyOn(dummyEvent, 'preventDefault');
+      jest.spyOn(dummyEvent, 'preventDefault').mockImplementation(() => {});
 
       glDropdownOptions.clicked({ e: dummyEvent });
 
diff --git a/spec/javascripts/new_branch_spec.js b/spec/frontend/new_branch_spec.js
index 4e3140ce4f1..cff7ec1a9ee 100644
--- a/spec/javascripts/new_branch_spec.js
+++ b/spec/frontend/new_branch_spec.js
@@ -1,8 +1,14 @@
 import $ from 'jquery';
 import NewBranchForm from '~/new_branch_form';
 
-describe('Branch', function() {
-  describe('create a new branch', function() {
+describe('Branch', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  describe('create a new branch', () => {
     preloadFixtures('branches/new_branch.html');
 
     function fillNameWith(value) {
@@ -15,30 +21,28 @@ describe('Branch', function() {
       expect($('.js-branch-name-error span').text()).toEqual(error);
     }
 
-    beforeEach(function() {
+    beforeEach(() => {
       loadFixtures('branches/new_branch.html');
-      $('form').on('submit', function(e) {
-        return e.preventDefault();
-      });
-      this.form = new NewBranchForm($('.js-create-branch-form'), []);
+      $('form').on('submit', e => e.preventDefault());
+      testContext.form = new NewBranchForm($('.js-create-branch-form'), []);
     });
 
-    it("can't start with a dot", function() {
+    it("can't start with a dot", () => {
       fillNameWith('.foo');
       expectToHaveError("can't start with '.'");
     });
 
-    it("can't start with a slash", function() {
+    it("can't start with a slash", () => {
       fillNameWith('/foo');
       expectToHaveError("can't start with '/'");
     });
 
-    it("can't have two consecutive dots", function() {
+    it("can't have two consecutive dots", () => {
       fillNameWith('foo..bar');
       expectToHaveError("can't contain '..'");
     });
 
-    it("can't have spaces anywhere", function() {
+    it("can't have spaces anywhere", () => {
       fillNameWith(' foo');
       expectToHaveError("can't contain spaces");
       fillNameWith('foo bar');
@@ -47,7 +51,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain spaces");
     });
 
-    it("can't have ~ anywhere", function() {
+    it("can't have ~ anywhere", () => {
       fillNameWith('~foo');
       expectToHaveError("can't contain '~'");
       fillNameWith('foo~bar');
@@ -56,7 +60,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '~'");
     });
 
-    it("can't have tilde anwhere", function() {
+    it("can't have tilde anwhere", () => {
       fillNameWith('~foo');
       expectToHaveError("can't contain '~'");
       fillNameWith('foo~bar');
@@ -65,7 +69,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '~'");
     });
 
-    it("can't have caret anywhere", function() {
+    it("can't have caret anywhere", () => {
       fillNameWith('^foo');
       expectToHaveError("can't contain '^'");
       fillNameWith('foo^bar');
@@ -74,7 +78,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '^'");
     });
 
-    it("can't have : anywhere", function() {
+    it("can't have : anywhere", () => {
       fillNameWith(':foo');
       expectToHaveError("can't contain ':'");
       fillNameWith('foo:bar');
@@ -83,7 +87,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain ':'");
     });
 
-    it("can't have question mark anywhere", function() {
+    it("can't have question mark anywhere", () => {
       fillNameWith('?foo');
       expectToHaveError("can't contain '?'");
       fillNameWith('foo?bar');
@@ -92,7 +96,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '?'");
     });
 
-    it("can't have asterisk anywhere", function() {
+    it("can't have asterisk anywhere", () => {
       fillNameWith('*foo');
       expectToHaveError("can't contain '*'");
       fillNameWith('foo*bar');
@@ -101,7 +105,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '*'");
     });
 
-    it("can't have open bracket anywhere", function() {
+    it("can't have open bracket anywhere", () => {
       fillNameWith('[foo');
       expectToHaveError("can't contain '['");
       fillNameWith('foo[bar');
@@ -110,7 +114,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '['");
     });
 
-    it("can't have a backslash anywhere", function() {
+    it("can't have a backslash anywhere", () => {
       fillNameWith('\\foo');
       expectToHaveError("can't contain '\\'");
       fillNameWith('foo\\bar');
@@ -119,7 +123,7 @@ describe('Branch', function() {
       expectToHaveError("can't contain '\\'");
     });
 
-    it("can't contain a sequence @{ anywhere", function() {
+    it("can't contain a sequence @{ anywhere", () => {
       fillNameWith('@{foo');
       expectToHaveError("can't contain '@{'");
       fillNameWith('foo@{bar');
@@ -128,42 +132,42 @@ describe('Branch', function() {
       expectToHaveError("can't contain '@{'");
     });
 
-    it("can't have consecutive slashes", function() {
+    it("can't have consecutive slashes", () => {
       fillNameWith('foo//bar');
       expectToHaveError("can't contain consecutive slashes");
     });
 
-    it("can't end with a slash", function() {
+    it("can't end with a slash", () => {
       fillNameWith('foo/');
       expectToHaveError("can't end in '/'");
     });
 
-    it("can't end with a dot", function() {
+    it("can't end with a dot", () => {
       fillNameWith('foo.');
       expectToHaveError("can't end in '.'");
     });
 
-    it("can't end with .lock", function() {
+    it("can't end with .lock", () => {
       fillNameWith('foo.lock');
       expectToHaveError("can't end in '.lock'");
     });
 
-    it("can't be the single character @", function() {
+    it("can't be the single character @", () => {
       fillNameWith('@');
       expectToHaveError("can't be '@'");
     });
 
-    it('concatenates all error messages', function() {
+    it('concatenates all error messages', () => {
       fillNameWith('/foo bar?~.');
       expectToHaveError("can't start with '/', can't contain spaces, '?', '~', can't end in '.'");
     });
 
-    it("doesn't duplicate error messages", function() {
+    it("doesn't duplicate error messages", () => {
       fillNameWith('?foo?bar?zoo?');
       expectToHaveError("can't contain '?'");
     });
 
-    it('removes the error message when is a valid name', function() {
+    it('removes the error message when is a valid name', () => {
       fillNameWith('foo?bar');
 
       expect($('.js-branch-name-error span').length).toEqual(1);
@@ -172,25 +176,25 @@ describe('Branch', function() {
       expect($('.js-branch-name-error span').length).toEqual(0);
     });
 
-    it('can have dashes anywhere', function() {
+    it('can have dashes anywhere', () => {
       fillNameWith('-foo-bar-zoo-');
 
       expect($('.js-branch-name-error span').length).toEqual(0);
     });
 
-    it('can have underscores anywhere', function() {
+    it('can have underscores anywhere', () => {
       fillNameWith('_foo_bar_zoo_');
 
       expect($('.js-branch-name-error span').length).toEqual(0);
     });
 
-    it('can have numbers anywhere', function() {
+    it('can have numbers anywhere', () => {
       fillNameWith('1foo2bar3zoo4');
 
       expect($('.js-branch-name-error span').length).toEqual(0);
     });
 
-    it('can be only letters', function() {
+    it('can be only letters', () => {
       fillNameWith('foo');
 
       expect($('.js-branch-name-error span').length).toEqual(0);
diff --git a/spec/javascripts/notes/components/discussion_filter_note_spec.js b/spec/frontend/notes/components/discussion_filter_note_spec.js
index 52d2e7ce947..6b5f42a84e8 100644
--- a/spec/javascripts/notes/components/discussion_filter_note_spec.js
+++ b/spec/frontend/notes/components/discussion_filter_note_spec.js
@@ -34,7 +34,7 @@ describe('DiscussionFilterNote component', () => {
   describe('methods', () => {
     describe('selectFilter', () => {
       it('emits `dropdownSelect` event on `eventHub` with provided param', () => {
-        spyOn(eventHub, '$emit');
+        jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
 
         vm.selectFilter(1);
 
@@ -74,7 +74,7 @@ describe('DiscussionFilterNote component', () => {
 
     it('clicking `Show all activity` button calls `selectFilter("all")` method', () => {
       const showAllBtn = vm.$el.querySelector('.discussion-filter-actions button:first-child');
-      spyOn(vm, 'selectFilter');
+      jest.spyOn(vm, 'selectFilter').mockImplementation(() => {});
 
       showAllBtn.dispatchEvent(new Event('click'));
 
@@ -83,7 +83,7 @@ describe('DiscussionFilterNote component', () => {
 
     it('clicking `Show comments only` button calls `selectFilter("comments")` method', () => {
       const showAllBtn = vm.$el.querySelector('.discussion-filter-actions button:last-child');
-      spyOn(vm, 'selectFilter');
+      jest.spyOn(vm, 'selectFilter').mockImplementation(() => {});
 
       showAllBtn.dispatchEvent(new Event('click'));
 
diff --git a/spec/javascripts/notes/components/note_header_spec.js b/spec/frontend/notes/components/note_header_spec.js
index 6d1a7ef370f..9b432387654 100644
--- a/spec/javascripts/notes/components/note_header_spec.js
+++ b/spec/frontend/notes/components/note_header_spec.js
@@ -90,7 +90,7 @@ describe('note_header component', () => {
     });
 
     it('emits toggle event on click', done => {
-      spyOn(vm, '$emit');
+      jest.spyOn(vm, '$emit').mockImplementation(() => {});
 
       vm.$el.querySelector('.js-vue-toggle-button').click();
 
diff --git a/spec/javascripts/notes/stores/getters_spec.js b/spec/frontend/notes/stores/getters_spec.js
index d69f469c7c7..83417bd70ef 100644
--- a/spec/javascripts/notes/stores/getters_spec.js
+++ b/spec/frontend/notes/stores/getters_spec.js
@@ -327,7 +327,7 @@ describe('Getters Notes Store', () => {
 
     beforeEach(() => {
       neighbor = {};
-      findUnresolvedDiscussionIdNeighbor = jasmine.createSpy().and.returnValue(neighbor);
+      findUnresolvedDiscussionIdNeighbor = jest.fn(() => neighbor);
       localGetters = { findUnresolvedDiscussionIdNeighbor };
     });
 
diff --git a/spec/javascripts/notes/stores/mutation_spec.js b/spec/frontend/notes/stores/mutation_spec.js
index ade4725dd68..49debe348e2 100644
--- a/spec/javascripts/notes/stores/mutation_spec.js
+++ b/spec/frontend/notes/stores/mutation_spec.js
@@ -498,7 +498,7 @@ describe('Notes Store mutations', () => {
       mutations.UPDATE_RESOLVABLE_DISCUSSIONS_COUNTS(state);
 
       expect(state).toEqual(
-        jasmine.objectContaining({
+        expect.objectContaining({
           resolvableDiscussionsCount: 1,
           unresolvedDiscussionsCount: 1,
           hasUnresolvedDiscussions: false,
@@ -535,7 +535,7 @@ describe('Notes Store mutations', () => {
       mutations.UPDATE_RESOLVABLE_DISCUSSIONS_COUNTS(state);
 
       expect(state).toEqual(
-        jasmine.objectContaining({
+        expect.objectContaining({
           resolvableDiscussionsCount: 4,
           unresolvedDiscussionsCount: 2,
           hasUnresolvedDiscussions: true,
diff --git a/spec/javascripts/pages/projects/pipeline_schedules/shared/components/timezone_dropdown_spec.js b/spec/frontend/pages/projects/pipeline_schedules/shared/components/timezone_dropdown_spec.js
index 5f4dba5ecb9..8917251d285 100644
--- a/spec/javascripts/pages/projects/pipeline_schedules/shared/components/timezone_dropdown_spec.js
+++ b/spec/frontend/pages/projects/pipeline_schedules/shared/components/timezone_dropdown_spec.js
@@ -6,7 +6,7 @@ import TimezoneDropdown, {
   findTimezoneByIdentifier,
 } from '~/pages/projects/pipeline_schedules/shared/components/timezone_dropdown';
 
-describe('Timezone Dropdown', function() {
+describe('Timezone Dropdown', () => {
   preloadFixtures('pipeline_schedules/edit.html');
 
   let $inputEl = null;
@@ -81,7 +81,7 @@ describe('Timezone Dropdown', function() {
       });
 
       it('will call a provided handler when a new timezone is selected', () => {
-        const onSelectTimezone = jasmine.createSpy('onSelectTimezoneMock');
+        const onSelectTimezone = jest.fn();
         // eslint-disable-next-line no-new
         new TimezoneDropdown({
           $inputEl,
@@ -111,7 +111,7 @@ describe('Timezone Dropdown', function() {
       });
 
       it('will call a provided `displayFormat` handler to format the dropdown value', () => {
-        const displayFormat = jasmine.createSpy('displayFormat');
+        const displayFormat = jest.fn();
         // eslint-disable-next-line no-new
         new TimezoneDropdown({
           $inputEl,
diff --git a/spec/javascripts/pipelines/nav_controls_spec.js b/spec/frontend/pipelines/nav_controls_spec.js
index 7806cdf1477..6d28da0ea2a 100644
--- a/spec/javascripts/pipelines/nav_controls_spec.js
+++ b/spec/frontend/pipelines/nav_controls_spec.js
@@ -75,7 +75,7 @@ describe('Pipelines Nav Controls', () => {
     });
 
     it('should emit postAction event when reset runner cache button is clicked', () => {
-      spyOn(component, '$emit');
+      jest.spyOn(component, '$emit').mockImplementation(() => {});
 
       component.$el.querySelector('.js-clear-cache').click();
 
diff --git a/spec/frontend/polyfills/element_spec.js b/spec/frontend/polyfills/element_spec.js
new file mode 100644
index 00000000000..64ce248ca44
--- /dev/null
+++ b/spec/frontend/polyfills/element_spec.js
@@ -0,0 +1,46 @@
+import '~/commons/polyfills/element';
+
+describe('Element polyfills', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  beforeEach(() => {
+    testContext.element = document.createElement('ul');
+  });
+
+  describe('matches', () => {
+    it('returns true if element matches the selector', () => {
+      expect(testContext.element.matches('ul')).toBeTruthy();
+    });
+
+    it("returns false if element doesn't match the selector", () => {
+      expect(testContext.element.matches('.not-an-element')).toBeFalsy();
+    });
+  });
+
+  describe('closest', () => {
+    beforeEach(() => {
+      testContext.childElement = document.createElement('li');
+      testContext.element.appendChild(testContext.childElement);
+    });
+
+    it('returns the closest parent that matches the selector', () => {
+      expect(testContext.childElement.closest('ul').toString()).toBe(
+        testContext.element.toString(),
+      );
+    });
+
+    it('returns itself if it matches the selector', () => {
+      expect(testContext.childElement.closest('li').toString()).toBe(
+        testContext.childElement.toString(),
+      );
+    });
+
+    it('returns undefined if nothing matches the selector', () => {
+      expect(testContext.childElement.closest('.no-an-element')).toBeFalsy();
+    });
+  });
+});
diff --git a/spec/javascripts/profile/add_ssh_key_validation_spec.js b/spec/frontend/profile/add_ssh_key_validation_spec.js
index c71a2885acc..1fec864599c 100644
--- a/spec/javascripts/profile/add_ssh_key_validation_spec.js
+++ b/spec/frontend/profile/add_ssh_key_validation_spec.js
@@ -4,16 +4,18 @@ describe('AddSshKeyValidation', () => {
   describe('submit', () => {
     it('returns true if isValid is true', () => {
       const addSshKeyValidation = new AddSshKeyValidation({});
-      spyOn(AddSshKeyValidation, 'isPublicKey').and.returnValue(true);
+      jest.spyOn(AddSshKeyValidation, 'isPublicKey').mockReturnValue(true);
 
       expect(addSshKeyValidation.submit()).toBeTruthy();
     });
 
     it('calls preventDefault and toggleWarning if isValid is false', () => {
       const addSshKeyValidation = new AddSshKeyValidation({});
-      const event = jasmine.createSpyObj('event', ['preventDefault']);
-      spyOn(AddSshKeyValidation, 'isPublicKey').and.returnValue(false);
-      spyOn(addSshKeyValidation, 'toggleWarning');
+      const event = {
+        preventDefault: jest.fn(),
+      };
+      jest.spyOn(AddSshKeyValidation, 'isPublicKey').mockReturnValue(false);
+      jest.spyOn(addSshKeyValidation, 'toggleWarning').mockImplementation(() => {});
 
       addSshKeyValidation.submit(event);
 
diff --git a/spec/frontend/project_select_combo_button_spec.js b/spec/frontend/project_select_combo_button_spec.js
new file mode 100644
index 00000000000..c47db71b4ac
--- /dev/null
+++ b/spec/frontend/project_select_combo_button_spec.js
@@ -0,0 +1,140 @@
+import $ from 'jquery';
+import ProjectSelectComboButton from '~/project_select_combo_button';
+
+const fixturePath = 'static/project_select_combo_button.html';
+
+describe('Project Select Combo Button', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  preloadFixtures(fixturePath);
+
+  beforeEach(() => {
+    testContext.defaults = {
+      label: 'Select project to create issue',
+      groupId: 12345,
+      projectMeta: {
+        name: 'My Cool Project',
+        url: 'http://mycoolproject.com',
+      },
+      newProjectMeta: {
+        name: 'My Other Cool Project',
+        url: 'http://myothercoolproject.com',
+      },
+      localStorageKey: 'group-12345-new-issue-recent-project',
+      relativePath: 'issues/new',
+    };
+
+    loadFixtures(fixturePath);
+
+    testContext.newItemBtn = document.querySelector('.new-project-item-link');
+    testContext.projectSelectInput = document.querySelector('.project-item-select');
+  });
+
+  describe('on page load when localStorage is empty', () => {
+    beforeEach(() => {
+      testContext.comboButton = new ProjectSelectComboButton(testContext.projectSelectInput);
+    });
+
+    it('newItemBtn href is null', () => {
+      expect(testContext.newItemBtn.getAttribute('href')).toBe('');
+    });
+
+    it('newItemBtn text is the plain default label', () => {
+      expect(testContext.newItemBtn.textContent).toBe(testContext.defaults.label);
+    });
+  });
+
+  describe('on page load when localStorage is filled', () => {
+    beforeEach(() => {
+      window.localStorage.setItem(
+        testContext.defaults.localStorageKey,
+        JSON.stringify(testContext.defaults.projectMeta),
+      );
+      testContext.comboButton = new ProjectSelectComboButton(testContext.projectSelectInput);
+    });
+
+    it('newItemBtn href is correctly set', () => {
+      expect(testContext.newItemBtn.getAttribute('href')).toBe(
+        testContext.defaults.projectMeta.url,
+      );
+    });
+
+    it('newItemBtn text is the cached label', () => {
+      expect(testContext.newItemBtn.textContent).toBe(
+        `New issue in ${testContext.defaults.projectMeta.name}`,
+      );
+    });
+
+    afterEach(() => {
+      window.localStorage.clear();
+    });
+  });
+
+  describe('after selecting a new project', () => {
+    beforeEach(() => {
+      testContext.comboButton = new ProjectSelectComboButton(testContext.projectSelectInput);
+
+      // mock the effect of selecting an item from the projects dropdown (select2)
+      $('.project-item-select')
+        .val(JSON.stringify(testContext.defaults.newProjectMeta))
+        .trigger('change');
+    });
+
+    it('newItemBtn href is correctly set', () => {
+      expect(testContext.newItemBtn.getAttribute('href')).toBe(
+        'http://myothercoolproject.com/issues/new',
+      );
+    });
+
+    it('newItemBtn text is the selected project label', () => {
+      expect(testContext.newItemBtn.textContent).toBe(
+        `New issue in ${testContext.defaults.newProjectMeta.name}`,
+      );
+    });
+
+    afterEach(() => {
+      window.localStorage.clear();
+    });
+  });
+
+  describe('deriveTextVariants', () => {
+    beforeEach(() => {
+      testContext.mockExecutionContext = {
+        resourceType: '',
+        resourceLabel: '',
+      };
+
+      testContext.comboButton = new ProjectSelectComboButton(testContext.projectSelectInput);
+
+      testContext.method = testContext.comboButton.deriveTextVariants.bind(
+        testContext.mockExecutionContext,
+      );
+    });
+
+    it('correctly derives test variants for merge requests', () => {
+      testContext.mockExecutionContext.resourceType = 'merge_requests';
+      testContext.mockExecutionContext.resourceLabel = 'New merge request';
+
+      const returnedVariants = testContext.method();
+
+      expect(returnedVariants.localStorageItemType).toBe('new-merge-request');
+      expect(returnedVariants.defaultTextPrefix).toBe('New merge request');
+      expect(returnedVariants.presetTextSuffix).toBe('merge request');
+    });
+
+    it('correctly derives text variants for issues', () => {
+      testContext.mockExecutionContext.resourceType = 'issues';
+      testContext.mockExecutionContext.resourceLabel = 'New issue';
+
+      const returnedVariants = testContext.method();
+
+      expect(returnedVariants.localStorageItemType).toBe('new-issue');
+      expect(returnedVariants.defaultTextPrefix).toBe('New issue');
+      expect(returnedVariants.presetTextSuffix).toBe('issue');
+    });
+  });
+});
diff --git a/spec/javascripts/shared/popover_spec.js b/spec/frontend/shared/popover_spec.js
index cc2b2014d38..bbde936185e 100644
--- a/spec/javascripts/shared/popover_spec.js
+++ b/spec/frontend/shared/popover_spec.js
@@ -29,7 +29,7 @@ describe('popover', () => {
           toggleClass: () => {},
         };
 
-        spyOn(context, 'popover').and.callFake(method => {
+        jest.spyOn(context, 'popover').mockImplementation(method => {
           expect(method).toEqual('show');
           done();
         });
@@ -44,7 +44,7 @@ describe('popover', () => {
           toggleClass: () => {},
         };
 
-        spyOn(context, 'toggleClass').and.callFake((classNames, show) => {
+        jest.spyOn(context, 'toggleClass').mockImplementation((classNames, show) => {
           expect(classNames).toEqual('disable-animation js-popover-show');
           expect(show).toEqual(true);
           done();
@@ -80,7 +80,7 @@ describe('popover', () => {
           toggleClass: () => {},
         };
 
-        spyOn(context, 'popover').and.callFake(method => {
+        jest.spyOn(context, 'popover').mockImplementation(method => {
           expect(method).toEqual('hide');
           done();
         });
@@ -95,7 +95,7 @@ describe('popover', () => {
           toggleClass: () => {},
         };
 
-        spyOn(context, 'toggleClass').and.callFake((classNames, show) => {
+        jest.spyOn(context, 'toggleClass').mockImplementation((classNames, show) => {
           expect(classNames).toEqual('disable-animation js-popover-show');
           expect(show).toEqual(false);
           done();
@@ -112,13 +112,13 @@ describe('popover', () => {
         length: 0,
       };
 
-      spyOn($.fn, 'init').and.callFake(selector =>
-        selector === '.popover:hover' ? fakeJquery : $.fn,
-      );
-      spyOn(togglePopover, 'call');
+      jest
+        .spyOn($.fn, 'init')
+        .mockImplementation(selector => (selector === '.popover:hover' ? fakeJquery : $.fn));
+      jest.spyOn(togglePopover, 'call').mockImplementation(() => {});
       mouseleave();
 
-      expect(togglePopover.call).toHaveBeenCalledWith(jasmine.any(Object), false);
+      expect(togglePopover.call).toHaveBeenCalledWith(expect.any(Object), false);
     });
 
     it('does not call hide popover if .popover:hover is true', () => {
@@ -126,10 +126,10 @@ describe('popover', () => {
         length: 1,
       };
 
-      spyOn($.fn, 'init').and.callFake(selector =>
-        selector === '.popover:hover' ? fakeJquery : $.fn,
-      );
-      spyOn(togglePopover, 'call');
+      jest
+        .spyOn($.fn, 'init')
+        .mockImplementation(selector => (selector === '.popover:hover' ? fakeJquery : $.fn));
+      jest.spyOn(togglePopover, 'call').mockImplementation(() => {});
       mouseleave();
 
       expect(togglePopover.call).not.toHaveBeenCalledWith(false);
@@ -140,15 +140,15 @@ describe('popover', () => {
     const context = {};
 
     it('shows popover', () => {
-      spyOn(togglePopover, 'call').and.returnValue(false);
+      jest.spyOn(togglePopover, 'call').mockReturnValue(false);
       mouseenter.call(context);
 
-      expect(togglePopover.call).toHaveBeenCalledWith(jasmine.any(Object), true);
+      expect(togglePopover.call).toHaveBeenCalledWith(expect.any(Object), true);
     });
 
     it('registers mouseleave event if popover is showed', done => {
-      spyOn(togglePopover, 'call').and.returnValue(true);
-      spyOn($.fn, 'on').and.callFake(eventName => {
+      jest.spyOn(togglePopover, 'call').mockReturnValue(true);
+      jest.spyOn($.fn, 'on').mockImplementation(eventName => {
         expect(eventName).toEqual('mouseleave');
         done();
       });
@@ -156,8 +156,8 @@ describe('popover', () => {
     });
 
     it('does not register mouseleave event if popover is not showed', () => {
-      spyOn(togglePopover, 'call').and.returnValue(false);
-      const spy = spyOn($.fn, 'on').and.callFake(() => {});
+      jest.spyOn(togglePopover, 'call').mockReturnValue(false);
+      const spy = jest.spyOn($.fn, 'on').mockImplementation(() => {});
       mouseenter.call(context);
 
       expect(spy).not.toHaveBeenCalled();
diff --git a/spec/frontend/sidebar/sidebar_store_spec.js b/spec/frontend/sidebar/sidebar_store_spec.js
new file mode 100644
index 00000000000..6d063a7cfcf
--- /dev/null
+++ b/spec/frontend/sidebar/sidebar_store_spec.js
@@ -0,0 +1,168 @@
+import SidebarStore from '~/sidebar/stores/sidebar_store';
+import Mock from './mock_data';
+import UsersMockHelper from '../helpers/user_mock_data_helper';
+
+const ASSIGNEE = {
+  id: 2,
+  name: 'gitlab user 2',
+  username: 'gitlab2',
+  avatar_url: 'https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+};
+
+const ANOTHER_ASSINEE = {
+  id: 3,
+  name: 'gitlab user 3',
+  username: 'gitlab3',
+  avatar_url: 'https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+};
+
+const PARTICIPANT = {
+  id: 1,
+  state: 'active',
+  username: 'marcene',
+  name: 'Allie Will',
+  web_url: 'foo.com',
+  avatar_url: 'gravatar.com/avatar/xxx',
+};
+
+const PARTICIPANT_LIST = [PARTICIPANT, { ...PARTICIPANT, id: 2 }, { ...PARTICIPANT, id: 3 }];
+
+describe('Sidebar store', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  beforeEach(() => {
+    testContext.store = new SidebarStore({
+      currentUser: {
+        id: 1,
+        name: 'Administrator',
+        username: 'root',
+        avatar_url:
+          'https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+      },
+      editable: true,
+      rootPath: '/',
+      endpoint: '/gitlab-org/gitlab-shell/issues/5.json',
+    });
+  });
+
+  afterEach(() => {
+    SidebarStore.singleton = null;
+  });
+
+  it('has default isFetching values', () => {
+    expect(testContext.store.isFetching.assignees).toBe(true);
+  });
+
+  it('adds a new assignee', () => {
+    testContext.store.addAssignee(ASSIGNEE);
+
+    expect(testContext.store.assignees.length).toEqual(1);
+  });
+
+  it('removes an assignee', () => {
+    testContext.store.removeAssignee(ASSIGNEE);
+
+    expect(testContext.store.assignees.length).toEqual(0);
+  });
+
+  it('finds an existent assignee', () => {
+    let foundAssignee;
+
+    testContext.store.addAssignee(ASSIGNEE);
+    foundAssignee = testContext.store.findAssignee(ASSIGNEE);
+
+    expect(foundAssignee).toBeDefined();
+    expect(foundAssignee).toEqual(ASSIGNEE);
+    foundAssignee = testContext.store.findAssignee(ANOTHER_ASSINEE);
+
+    expect(foundAssignee).toBeUndefined();
+  });
+
+  it('removes all assignees', () => {
+    testContext.store.removeAllAssignees();
+
+    expect(testContext.store.assignees.length).toEqual(0);
+  });
+
+  it('sets participants data', () => {
+    expect(testContext.store.participants.length).toEqual(0);
+
+    testContext.store.setParticipantsData({
+      participants: PARTICIPANT_LIST,
+    });
+
+    expect(testContext.store.isFetching.participants).toEqual(false);
+    expect(testContext.store.participants.length).toEqual(PARTICIPANT_LIST.length);
+  });
+
+  it('sets subcriptions data', () => {
+    expect(testContext.store.subscribed).toEqual(null);
+
+    testContext.store.setSubscriptionsData({
+      subscribed: true,
+    });
+
+    expect(testContext.store.isFetching.subscriptions).toEqual(false);
+    expect(testContext.store.subscribed).toEqual(true);
+  });
+
+  it('set assigned data', () => {
+    const users = {
+      assignees: UsersMockHelper.createNumberRandomUsers(3),
+    };
+
+    testContext.store.setAssigneeData(users);
+
+    expect(testContext.store.isFetching.assignees).toBe(false);
+    expect(testContext.store.assignees.length).toEqual(3);
+  });
+
+  it('sets fetching state', () => {
+    expect(testContext.store.isFetching.participants).toEqual(true);
+
+    testContext.store.setFetchingState('participants', false);
+
+    expect(testContext.store.isFetching.participants).toEqual(false);
+  });
+
+  it('sets loading state', () => {
+    testContext.store.setLoadingState('assignees', true);
+
+    expect(testContext.store.isLoading.assignees).toEqual(true);
+  });
+
+  it('set time tracking data', () => {
+    testContext.store.setTimeTrackingData(Mock.time);
+
+    expect(testContext.store.timeEstimate).toEqual(Mock.time.time_estimate);
+    expect(testContext.store.totalTimeSpent).toEqual(Mock.time.total_time_spent);
+    expect(testContext.store.humanTimeEstimate).toEqual(Mock.time.human_time_estimate);
+    expect(testContext.store.humanTotalTimeSpent).toEqual(Mock.time.human_total_time_spent);
+  });
+
+  it('set autocomplete projects', () => {
+    const projects = [{ id: 0 }];
+    testContext.store.setAutocompleteProjects(projects);
+
+    expect(testContext.store.autocompleteProjects).toEqual(projects);
+  });
+
+  it('sets subscribed state', () => {
+    expect(testContext.store.subscribed).toEqual(null);
+
+    testContext.store.setSubscribedState(true);
+
+    expect(testContext.store.subscribed).toEqual(true);
+  });
+
+  it('set move to project ID', () => {
+    const projectId = 7;
+    testContext.store.setMoveToProjectId(projectId);
+
+    expect(testContext.store.moveToProjectId).toEqual(projectId);
+  });
+});
diff --git a/spec/javascripts/syntax_highlight_spec.js b/spec/frontend/syntax_highlight_spec.js
index 99c47fa31d4..d2fb5983f7b 100644
--- a/spec/javascripts/syntax_highlight_spec.js
+++ b/spec/frontend/syntax_highlight_spec.js
@@ -3,19 +3,19 @@
 import $ from 'jquery';
 import syntaxHighlight from '~/syntax_highlight';
 
-describe('Syntax Highlighter', function() {
-  const stubUserColorScheme = function(value) {
+describe('Syntax Highlighter', () => {
+  const stubUserColorScheme = value => {
     if (window.gon == null) {
       window.gon = {};
     }
     return (window.gon.user_color_scheme = value);
   };
-  describe('on a js-syntax-highlight element', function() {
-    beforeEach(function() {
-      return setFixtures('<div class="js-syntax-highlight"></div>');
+  describe('on a js-syntax-highlight element', () => {
+    beforeEach(() => {
+      setFixtures('<div class="js-syntax-highlight"></div>');
     });
 
-    it('applies syntax highlighting', function() {
+    it('applies syntax highlighting', () => {
       stubUserColorScheme('monokai');
       syntaxHighlight($('.js-syntax-highlight'));
 
@@ -23,14 +23,14 @@ describe('Syntax Highlighter', function() {
     });
   });
 
-  describe('on a parent element', function() {
-    beforeEach(function() {
-      return setFixtures(
+  describe('on a parent element', () => {
+    beforeEach(() => {
+      setFixtures(
         '<div class="parent">\n  <div class="js-syntax-highlight"></div>\n  <div class="foo"></div>\n  <div class="js-syntax-highlight"></div>\n</div>',
       );
     });
 
-    it('applies highlighting to all applicable children', function() {
+    it('applies highlighting to all applicable children', () => {
       stubUserColorScheme('monokai');
       syntaxHighlight($('.parent'));
 
@@ -38,11 +38,9 @@ describe('Syntax Highlighter', function() {
       expect($('.monokai').length).toBe(2);
     });
 
-    it('prevents an infinite loop when no matches exist', function() {
+    it('prevents an infinite loop when no matches exist', () => {
       setFixtures('<div></div>');
-      const highlight = function() {
-        return syntaxHighlight($('div'));
-      };
+      const highlight = () => syntaxHighlight($('div'));
 
       expect(highlight).not.toThrow();
     });
diff --git a/spec/javascripts/task_list_spec.js b/spec/frontend/task_list_spec.js
index 563f402de58..1261833e3ec 100644
--- a/spec/javascripts/task_list_spec.js
+++ b/spec/frontend/task_list_spec.js
@@ -25,10 +25,10 @@ describe('TaskList', () => {
   });
 
   it('should call init when the class constructed', () => {
-    spyOn(TaskList.prototype, 'init').and.callThrough();
-    spyOn(TaskList.prototype, 'disable');
-    spyOn($.prototype, 'taskList');
-    spyOn($.prototype, 'on');
+    jest.spyOn(TaskList.prototype, 'init');
+    jest.spyOn(TaskList.prototype, 'disable').mockImplementation(() => {});
+    jest.spyOn($.prototype, 'taskList').mockImplementation(() => {});
+    jest.spyOn($.prototype, 'on').mockImplementation(() => {});
 
     taskList = createTaskList();
     const $taskListEl = $(taskList.taskListContainerSelector);
@@ -59,7 +59,7 @@ describe('TaskList', () => {
 
   describe('disableTaskListItems', () => {
     it('should call taskList method with disable param', () => {
-      spyOn($.prototype, 'taskList');
+      jest.spyOn($.prototype, 'taskList').mockImplementation(() => {});
 
       taskList.disableTaskListItems({ currentTarget });
 
@@ -69,7 +69,7 @@ describe('TaskList', () => {
 
   describe('enableTaskListItems', () => {
     it('should call taskList method with enable param', () => {
-      spyOn($.prototype, 'taskList');
+      jest.spyOn($.prototype, 'taskList').mockImplementation(() => {});
 
       taskList.enableTaskListItems({ currentTarget });
 
@@ -79,8 +79,8 @@ describe('TaskList', () => {
 
   describe('disable', () => {
     it('should disable task list items and off document event', () => {
-      spyOn(taskList, 'disableTaskListItems');
-      spyOn($.prototype, 'off');
+      jest.spyOn(taskList, 'disableTaskListItems').mockImplementation(() => {});
+      jest.spyOn($.prototype, 'off').mockImplementation(() => {});
 
       taskList.disable();
 
@@ -95,10 +95,10 @@ describe('TaskList', () => {
   describe('update', () => {
     it('should disable task list items and make a patch request then enable them again', done => {
       const response = { data: { lock_version: 3 } };
-      spyOn(taskList, 'enableTaskListItems');
-      spyOn(taskList, 'disableTaskListItems');
-      spyOn(taskList, 'onSuccess');
-      spyOn(axios, 'patch').and.returnValue(Promise.resolve(response));
+      jest.spyOn(taskList, 'enableTaskListItems').mockImplementation(() => {});
+      jest.spyOn(taskList, 'disableTaskListItems').mockImplementation(() => {});
+      jest.spyOn(taskList, 'onSuccess').mockImplementation(() => {});
+      jest.spyOn(axios, 'patch').mockReturnValue(Promise.resolve(response));
 
       const value = 'hello world';
       const endpoint = '/foo';
@@ -139,9 +139,9 @@ describe('TaskList', () => {
 
   it('should handle request error and enable task list items', done => {
     const response = { data: { error: 1 } };
-    spyOn(taskList, 'enableTaskListItems');
-    spyOn(taskList, 'onError');
-    spyOn(axios, 'patch').and.returnValue(Promise.reject({ response })); // eslint-disable-line prefer-promise-reject-errors
+    jest.spyOn(taskList, 'enableTaskListItems').mockImplementation(() => {});
+    jest.spyOn(taskList, 'onError').mockImplementation(() => {});
+    jest.spyOn(axios, 'patch').mockReturnValue(Promise.reject({ response })); // eslint-disable-line prefer-promise-reject-errors
 
     const event = { detail: {} };
     taskList
diff --git a/spec/frontend/version_check_image_spec.js b/spec/frontend/version_check_image_spec.js
new file mode 100644
index 00000000000..2ab157105a1
--- /dev/null
+++ b/spec/frontend/version_check_image_spec.js
@@ -0,0 +1,42 @@
+import $ from 'jquery';
+import VersionCheckImage from '~/version_check_image';
+import ClassSpecHelper from './helpers/class_spec_helper';
+
+describe('VersionCheckImage', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  describe('bindErrorEvent', () => {
+    ClassSpecHelper.itShouldBeAStaticMethod(VersionCheckImage, 'bindErrorEvent');
+
+    beforeEach(() => {
+      testContext.imageElement = $('<div></div>');
+    });
+
+    it('registers an error event', () => {
+      jest.spyOn($.prototype, 'on').mockImplementation(() => {});
+      // eslint-disable-next-line func-names
+      jest.spyOn($.prototype, 'off').mockImplementation(function() {
+        return this;
+      });
+
+      VersionCheckImage.bindErrorEvent(testContext.imageElement);
+
+      expect($.prototype.off).toHaveBeenCalledWith('error');
+      expect($.prototype.on).toHaveBeenCalledWith('error', expect.any(Function));
+    });
+
+    it('hides the imageElement on error', () => {
+      jest.spyOn($.prototype, 'hide').mockImplementation(() => {});
+
+      VersionCheckImage.bindErrorEvent(testContext.imageElement);
+
+      testContext.imageElement.trigger('error');
+
+      expect($.prototype.hide).toHaveBeenCalled();
+    });
+  });
+});
diff --git a/spec/javascripts/vue_shared/components/gl_modal_vuex_spec.js b/spec/frontend/vue_shared/components/gl_modal_vuex_spec.js
index eb78d37db3e..4b7636041b6 100644
--- a/spec/javascripts/vue_shared/components/gl_modal_vuex_spec.js
+++ b/spec/frontend/vue_shared/components/gl_modal_vuex_spec.js
@@ -45,8 +45,8 @@ describe('GlModalVuex', () => {
     state = createState();
 
     actions = {
-      show: jasmine.createSpy('show'),
-      hide: jasmine.createSpy('hide'),
+      show: jest.fn(),
+      hide: jest.fn(),
     };
   });
 
@@ -81,7 +81,7 @@ describe('GlModalVuex', () => {
   });
 
   it('passes listeners through to gl-modal', () => {
-    const ok = jasmine.createSpy('ok');
+    const ok = jest.fn();
 
     factory({
       listeners: { ok },
@@ -119,7 +119,7 @@ describe('GlModalVuex', () => {
     state.isVisible = false;
 
     factory();
-    const rootEmit = spyOn(wrapper.vm.$root, '$emit');
+    const rootEmit = jest.spyOn(wrapper.vm.$root, '$emit');
 
     state.isVisible = true;
 
@@ -136,7 +136,7 @@ describe('GlModalVuex', () => {
     state.isVisible = true;
 
     factory();
-    const rootEmit = spyOn(wrapper.vm.$root, '$emit');
+    const rootEmit = jest.spyOn(wrapper.vm.$root, '$emit');
 
     state.isVisible = false;
 
diff --git a/spec/javascripts/vue_shared/components/markdown/suggestion_diff_spec.js b/spec/frontend/vue_shared/components/markdown/suggestion_diff_spec.js
index dc929e83eb7..3c5e7500ba7 100644
--- a/spec/javascripts/vue_shared/components/markdown/suggestion_diff_spec.js
+++ b/spec/frontend/vue_shared/components/markdown/suggestion_diff_spec.js
@@ -92,7 +92,7 @@ describe('Suggestion Diff component', () => {
   describe('applySuggestion', () => {
     it('emits apply event when applySuggestion is called', () => {
       const callback = () => {};
-      spyOn(vm, '$emit');
+      jest.spyOn(vm, '$emit').mockImplementation(() => {});
       vm.applySuggestion(callback);
 
       expect(vm.$emit).toHaveBeenCalledWith('apply', { suggestionId: vm.suggestion.id, callback });
diff --git a/spec/javascripts/vue_shared/components/user_avatar/user_avatar_list_spec.js b/spec/frontend/vue_shared/components/user_avatar/user_avatar_list_spec.js
index 96bc3b0cc17..9f0cdc651b6 100644
--- a/spec/javascripts/vue_shared/components/user_avatar/user_avatar_list_spec.js
+++ b/spec/frontend/vue_shared/components/user_avatar/user_avatar_list_spec.js
@@ -86,7 +86,7 @@ describe('UserAvatarList', () => {
 
       expect(linkProps).toEqual(
         items.map(x =>
-          jasmine.objectContaining({
+          expect.objectContaining({
             linkHref: x.web_url,
             imgSrc: x.avatar_url,
             imgAlt: x.name,
diff --git a/spec/javascripts/behaviors/bind_in_out_spec.js b/spec/javascripts/behaviors/bind_in_out_spec.js
deleted file mode 100644
index 0c214f5886a..00000000000
--- a/spec/javascripts/behaviors/bind_in_out_spec.js
+++ /dev/null
@@ -1,192 +0,0 @@
-import BindInOut from '~/behaviors/bind_in_out';
-import ClassSpecHelper from '../helpers/class_spec_helper';
-
-describe('BindInOut', function() {
-  describe('constructor', function() {
-    beforeEach(function() {
-      this.in = {};
-      this.out = {};
-
-      this.bindInOut = new BindInOut(this.in, this.out);
-    });
-
-    it('should set .in', function() {
-      expect(this.bindInOut.in).toBe(this.in);
-    });
-
-    it('should set .out', function() {
-      expect(this.bindInOut.out).toBe(this.out);
-    });
-
-    it('should set .eventWrapper', function() {
-      expect(this.bindInOut.eventWrapper).toEqual({});
-    });
-
-    describe('if .in is an input', function() {
-      beforeEach(function() {
-        this.bindInOut = new BindInOut({ tagName: 'INPUT' });
-      });
-
-      it('should set .eventType to keyup ', function() {
-        expect(this.bindInOut.eventType).toEqual('keyup');
-      });
-    });
-
-    describe('if .in is a textarea', function() {
-      beforeEach(function() {
-        this.bindInOut = new BindInOut({ tagName: 'TEXTAREA' });
-      });
-
-      it('should set .eventType to keyup ', function() {
-        expect(this.bindInOut.eventType).toEqual('keyup');
-      });
-    });
-
-    describe('if .in is not an input or textarea', function() {
-      beforeEach(function() {
-        this.bindInOut = new BindInOut({ tagName: 'SELECT' });
-      });
-
-      it('should set .eventType to change ', function() {
-        expect(this.bindInOut.eventType).toEqual('change');
-      });
-    });
-  });
-
-  describe('addEvents', function() {
-    beforeEach(function() {
-      this.in = jasmine.createSpyObj('in', ['addEventListener']);
-
-      this.bindInOut = new BindInOut(this.in);
-
-      this.addEvents = this.bindInOut.addEvents();
-    });
-
-    it('should set .eventWrapper.updateOut', function() {
-      expect(this.bindInOut.eventWrapper.updateOut).toEqual(jasmine.any(Function));
-    });
-
-    it('should call .addEventListener', function() {
-      expect(this.in.addEventListener).toHaveBeenCalledWith(
-        this.bindInOut.eventType,
-        this.bindInOut.eventWrapper.updateOut,
-      );
-    });
-
-    it('should return the instance', function() {
-      expect(this.addEvents).toBe(this.bindInOut);
-    });
-  });
-
-  describe('updateOut', function() {
-    beforeEach(function() {
-      this.in = { value: 'the-value' };
-      this.out = { textContent: 'not-the-value' };
-
-      this.bindInOut = new BindInOut(this.in, this.out);
-
-      this.updateOut = this.bindInOut.updateOut();
-    });
-
-    it('should set .out.textContent to .in.value', function() {
-      expect(this.out.textContent).toBe(this.in.value);
-    });
-
-    it('should return the instance', function() {
-      expect(this.updateOut).toBe(this.bindInOut);
-    });
-  });
-
-  describe('removeEvents', function() {
-    beforeEach(function() {
-      this.in = jasmine.createSpyObj('in', ['removeEventListener']);
-      this.updateOut = () => {};
-
-      this.bindInOut = new BindInOut(this.in);
-      this.bindInOut.eventWrapper.updateOut = this.updateOut;
-
-      this.removeEvents = this.bindInOut.removeEvents();
-    });
-
-    it('should call .removeEventListener', function() {
-      expect(this.in.removeEventListener).toHaveBeenCalledWith(
-        this.bindInOut.eventType,
-        this.updateOut,
-      );
-    });
-
-    it('should return the instance', function() {
-      expect(this.removeEvents).toBe(this.bindInOut);
-    });
-  });
-
-  describe('initAll', function() {
-    beforeEach(function() {
-      this.ins = [0, 1, 2];
-      this.instances = [];
-
-      spyOn(document, 'querySelectorAll').and.returnValue(this.ins);
-      spyOn(Array.prototype, 'map').and.callThrough();
-      spyOn(BindInOut, 'init');
-
-      this.initAll = BindInOut.initAll();
-    });
-
-    ClassSpecHelper.itShouldBeAStaticMethod(BindInOut, 'initAll');
-
-    it('should call .querySelectorAll', function() {
-      expect(document.querySelectorAll).toHaveBeenCalledWith('*[data-bind-in]');
-    });
-
-    it('should call .map', function() {
-      expect(Array.prototype.map).toHaveBeenCalledWith(jasmine.any(Function));
-    });
-
-    it('should call .init for each element', function() {
-      expect(BindInOut.init.calls.count()).toEqual(3);
-    });
-
-    it('should return an array of instances', function() {
-      expect(this.initAll).toEqual(jasmine.any(Array));
-    });
-  });
-
-  describe('init', function() {
-    beforeEach(function() {
-      spyOn(BindInOut.prototype, 'addEvents').and.callFake(function() {
-        return this;
-      });
-      spyOn(BindInOut.prototype, 'updateOut').and.callFake(function() {
-        return this;
-      });
-
-      this.init = BindInOut.init({}, {});
-    });
-
-    ClassSpecHelper.itShouldBeAStaticMethod(BindInOut, 'init');
-
-    it('should call .addEvents', function() {
-      expect(BindInOut.prototype.addEvents).toHaveBeenCalled();
-    });
-
-    it('should call .updateOut', function() {
-      expect(BindInOut.prototype.updateOut).toHaveBeenCalled();
-    });
-
-    describe('if no anOut is provided', function() {
-      beforeEach(function() {
-        this.anIn = { dataset: { bindIn: 'the-data-bind-in' } };
-
-        spyOn(document, 'querySelector');
-
-        BindInOut.init(this.anIn);
-      });
-
-      it('should call .querySelector', function() {
-        expect(document.querySelector).toHaveBeenCalledWith(
-          `*[data-bind-out="${this.anIn.dataset.bindIn}"]`,
-        );
-      });
-    });
-  });
-});
diff --git a/spec/javascripts/droplab/constants_spec.js b/spec/javascripts/droplab/constants_spec.js
deleted file mode 100644
index 23b69defec6..00000000000
--- a/spec/javascripts/droplab/constants_spec.js
+++ /dev/null
@@ -1,39 +0,0 @@
-import * as constants from '~/droplab/constants';
-
-describe('constants', function() {
-  describe('DATA_TRIGGER', function() {
-    it('should be `data-dropdown-trigger`', function() {
-      expect(constants.DATA_TRIGGER).toBe('data-dropdown-trigger');
-    });
-  });
-
-  describe('DATA_DROPDOWN', function() {
-    it('should be `data-dropdown`', function() {
-      expect(constants.DATA_DROPDOWN).toBe('data-dropdown');
-    });
-  });
-
-  describe('SELECTED_CLASS', function() {
-    it('should be `droplab-item-selected`', function() {
-      expect(constants.SELECTED_CLASS).toBe('droplab-item-selected');
-    });
-  });
-
-  describe('ACTIVE_CLASS', function() {
-    it('should be `droplab-item-active`', function() {
-      expect(constants.ACTIVE_CLASS).toBe('droplab-item-active');
-    });
-  });
-
-  describe('TEMPLATE_REGEX', function() {
-    it('should be a handlebars templating syntax regex', function() {
-      expect(constants.TEMPLATE_REGEX).toEqual(/\{\{(.+?)\}\}/g);
-    });
-  });
-
-  describe('IGNORE_CLASS', function() {
-    it('should be `droplab-item-ignore`', function() {
-      expect(constants.IGNORE_CLASS).toBe('droplab-item-ignore');
-    });
-  });
-});
diff --git a/spec/javascripts/polyfills/element_spec.js b/spec/javascripts/polyfills/element_spec.js
deleted file mode 100644
index d35df595c72..00000000000
--- a/spec/javascripts/polyfills/element_spec.js
+++ /dev/null
@@ -1,36 +0,0 @@
-import '~/commons/polyfills/element';
-
-describe('Element polyfills', function() {
-  beforeEach(() => {
-    this.element = document.createElement('ul');
-  });
-
-  describe('matches', () => {
-    it('returns true if element matches the selector', () => {
-      expect(this.element.matches('ul')).toBeTruthy();
-    });
-
-    it("returns false if element doesn't match the selector", () => {
-      expect(this.element.matches('.not-an-element')).toBeFalsy();
-    });
-  });
-
-  describe('closest', () => {
-    beforeEach(() => {
-      this.childElement = document.createElement('li');
-      this.element.appendChild(this.childElement);
-    });
-
-    it('returns the closest parent that matches the selector', () => {
-      expect(this.childElement.closest('ul').toString()).toBe(this.element.toString());
-    });
-
-    it('returns itself if it matches the selector', () => {
-      expect(this.childElement.closest('li').toString()).toBe(this.childElement.toString());
-    });
-
-    it('returns undefined if nothing matches the selector', () => {
-      expect(this.childElement.closest('.no-an-element')).toBeFalsy();
-    });
-  });
-});
diff --git a/spec/javascripts/project_select_combo_button_spec.js b/spec/javascripts/project_select_combo_button_spec.js
deleted file mode 100644
index dc85292c23e..00000000000
--- a/spec/javascripts/project_select_combo_button_spec.js
+++ /dev/null
@@ -1,124 +0,0 @@
-import $ from 'jquery';
-import ProjectSelectComboButton from '~/project_select_combo_button';
-
-const fixturePath = 'static/project_select_combo_button.html';
-
-describe('Project Select Combo Button', function() {
-  preloadFixtures(fixturePath);
-
-  beforeEach(function() {
-    this.defaults = {
-      label: 'Select project to create issue',
-      groupId: 12345,
-      projectMeta: {
-        name: 'My Cool Project',
-        url: 'http://mycoolproject.com',
-      },
-      newProjectMeta: {
-        name: 'My Other Cool Project',
-        url: 'http://myothercoolproject.com',
-      },
-      localStorageKey: 'group-12345-new-issue-recent-project',
-      relativePath: 'issues/new',
-    };
-
-    loadFixtures(fixturePath);
-
-    this.newItemBtn = document.querySelector('.new-project-item-link');
-    this.projectSelectInput = document.querySelector('.project-item-select');
-  });
-
-  describe('on page load when localStorage is empty', function() {
-    beforeEach(function() {
-      this.comboButton = new ProjectSelectComboButton(this.projectSelectInput);
-    });
-
-    it('newItemBtn href is null', function() {
-      expect(this.newItemBtn.getAttribute('href')).toBe('');
-    });
-
-    it('newItemBtn text is the plain default label', function() {
-      expect(this.newItemBtn.textContent).toBe(this.defaults.label);
-    });
-  });
-
-  describe('on page load when localStorage is filled', function() {
-    beforeEach(function() {
-      window.localStorage.setItem(
-        this.defaults.localStorageKey,
-        JSON.stringify(this.defaults.projectMeta),
-      );
-      this.comboButton = new ProjectSelectComboButton(this.projectSelectInput);
-    });
-
-    it('newItemBtn href is correctly set', function() {
-      expect(this.newItemBtn.getAttribute('href')).toBe(this.defaults.projectMeta.url);
-    });
-
-    it('newItemBtn text is the cached label', function() {
-      expect(this.newItemBtn.textContent).toBe(`New issue in ${this.defaults.projectMeta.name}`);
-    });
-
-    afterEach(function() {
-      window.localStorage.clear();
-    });
-  });
-
-  describe('after selecting a new project', function() {
-    beforeEach(function() {
-      this.comboButton = new ProjectSelectComboButton(this.projectSelectInput);
-
-      // mock the effect of selecting an item from the projects dropdown (select2)
-      $('.project-item-select')
-        .val(JSON.stringify(this.defaults.newProjectMeta))
-        .trigger('change');
-    });
-
-    it('newItemBtn href is correctly set', function() {
-      expect(this.newItemBtn.getAttribute('href')).toBe('http://myothercoolproject.com/issues/new');
-    });
-
-    it('newItemBtn text is the selected project label', function() {
-      expect(this.newItemBtn.textContent).toBe(`New issue in ${this.defaults.newProjectMeta.name}`);
-    });
-
-    afterEach(function() {
-      window.localStorage.clear();
-    });
-  });
-
-  describe('deriveTextVariants', function() {
-    beforeEach(function() {
-      this.mockExecutionContext = {
-        resourceType: '',
-        resourceLabel: '',
-      };
-
-      this.comboButton = new ProjectSelectComboButton(this.projectSelectInput);
-
-      this.method = this.comboButton.deriveTextVariants.bind(this.mockExecutionContext);
-    });
-
-    it('correctly derives test variants for merge requests', function() {
-      this.mockExecutionContext.resourceType = 'merge_requests';
-      this.mockExecutionContext.resourceLabel = 'New merge request';
-
-      const returnedVariants = this.method();
-
-      expect(returnedVariants.localStorageItemType).toBe('new-merge-request');
-      expect(returnedVariants.defaultTextPrefix).toBe('New merge request');
-      expect(returnedVariants.presetTextSuffix).toBe('merge request');
-    });
-
-    it('correctly derives text variants for issues', function() {
-      this.mockExecutionContext.resourceType = 'issues';
-      this.mockExecutionContext.resourceLabel = 'New issue';
-
-      const returnedVariants = this.method();
-
-      expect(returnedVariants.localStorageItemType).toBe('new-issue');
-      expect(returnedVariants.defaultTextPrefix).toBe('New issue');
-      expect(returnedVariants.presetTextSuffix).toBe('issue');
-    });
-  });
-});
diff --git a/spec/javascripts/sidebar/sidebar_store_spec.js b/spec/javascripts/sidebar/sidebar_store_spec.js
deleted file mode 100644
index 85ff70fffbd..00000000000
--- a/spec/javascripts/sidebar/sidebar_store_spec.js
+++ /dev/null
@@ -1,162 +0,0 @@
-import SidebarStore from '~/sidebar/stores/sidebar_store';
-import Mock from './mock_data';
-import UsersMockHelper from '../helpers/user_mock_data_helper';
-
-const ASSIGNEE = {
-  id: 2,
-  name: 'gitlab user 2',
-  username: 'gitlab2',
-  avatar_url: 'https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
-};
-
-const ANOTHER_ASSINEE = {
-  id: 3,
-  name: 'gitlab user 3',
-  username: 'gitlab3',
-  avatar_url: 'https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
-};
-
-const PARTICIPANT = {
-  id: 1,
-  state: 'active',
-  username: 'marcene',
-  name: 'Allie Will',
-  web_url: 'foo.com',
-  avatar_url: 'gravatar.com/avatar/xxx',
-};
-
-const PARTICIPANT_LIST = [PARTICIPANT, { ...PARTICIPANT, id: 2 }, { ...PARTICIPANT, id: 3 }];
-
-describe('Sidebar store', function() {
-  beforeEach(() => {
-    this.store = new SidebarStore({
-      currentUser: {
-        id: 1,
-        name: 'Administrator',
-        username: 'root',
-        avatar_url:
-          'https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
-      },
-      editable: true,
-      rootPath: '/',
-      endpoint: '/gitlab-org/gitlab-shell/issues/5.json',
-    });
-  });
-
-  afterEach(() => {
-    SidebarStore.singleton = null;
-  });
-
-  it('has default isFetching values', () => {
-    expect(this.store.isFetching.assignees).toBe(true);
-  });
-
-  it('adds a new assignee', () => {
-    this.store.addAssignee(ASSIGNEE);
-
-    expect(this.store.assignees.length).toEqual(1);
-  });
-
-  it('removes an assignee', () => {
-    this.store.removeAssignee(ASSIGNEE);
-
-    expect(this.store.assignees.length).toEqual(0);
-  });
-
-  it('finds an existent assignee', () => {
-    let foundAssignee;
-
-    this.store.addAssignee(ASSIGNEE);
-    foundAssignee = this.store.findAssignee(ASSIGNEE);
-
-    expect(foundAssignee).toBeDefined();
-    expect(foundAssignee).toEqual(ASSIGNEE);
-    foundAssignee = this.store.findAssignee(ANOTHER_ASSINEE);
-
-    expect(foundAssignee).toBeUndefined();
-  });
-
-  it('removes all assignees', () => {
-    this.store.removeAllAssignees();
-
-    expect(this.store.assignees.length).toEqual(0);
-  });
-
-  it('sets participants data', () => {
-    expect(this.store.participants.length).toEqual(0);
-
-    this.store.setParticipantsData({
-      participants: PARTICIPANT_LIST,
-    });
-
-    expect(this.store.isFetching.participants).toEqual(false);
-    expect(this.store.participants.length).toEqual(PARTICIPANT_LIST.length);
-  });
-
-  it('sets subcriptions data', () => {
-    expect(this.store.subscribed).toEqual(null);
-
-    this.store.setSubscriptionsData({
-      subscribed: true,
-    });
-
-    expect(this.store.isFetching.subscriptions).toEqual(false);
-    expect(this.store.subscribed).toEqual(true);
-  });
-
-  it('set assigned data', () => {
-    const users = {
-      assignees: UsersMockHelper.createNumberRandomUsers(3),
-    };
-
-    this.store.setAssigneeData(users);
-
-    expect(this.store.isFetching.assignees).toBe(false);
-    expect(this.store.assignees.length).toEqual(3);
-  });
-
-  it('sets fetching state', () => {
-    expect(this.store.isFetching.participants).toEqual(true);
-
-    this.store.setFetchingState('participants', false);
-
-    expect(this.store.isFetching.participants).toEqual(false);
-  });
-
-  it('sets loading state', () => {
-    this.store.setLoadingState('assignees', true);
-
-    expect(this.store.isLoading.assignees).toEqual(true);
-  });
-
-  it('set time tracking data', () => {
-    this.store.setTimeTrackingData(Mock.time);
-
-    expect(this.store.timeEstimate).toEqual(Mock.time.time_estimate);
-    expect(this.store.totalTimeSpent).toEqual(Mock.time.total_time_spent);
-    expect(this.store.humanTimeEstimate).toEqual(Mock.time.human_time_estimate);
-    expect(this.store.humanTotalTimeSpent).toEqual(Mock.time.human_total_time_spent);
-  });
-
-  it('set autocomplete projects', () => {
-    const projects = [{ id: 0 }];
-    this.store.setAutocompleteProjects(projects);
-
-    expect(this.store.autocompleteProjects).toEqual(projects);
-  });
-
-  it('sets subscribed state', () => {
-    expect(this.store.subscribed).toEqual(null);
-
-    this.store.setSubscribedState(true);
-
-    expect(this.store.subscribed).toEqual(true);
-  });
-
-  it('set move to project ID', () => {
-    const projectId = 7;
-    this.store.setMoveToProjectId(projectId);
-
-    expect(this.store.moveToProjectId).toEqual(projectId);
-  });
-});
diff --git a/spec/javascripts/version_check_image_spec.js b/spec/javascripts/version_check_image_spec.js
deleted file mode 100644
index 0e69fcc4c5f..00000000000
--- a/spec/javascripts/version_check_image_spec.js
+++ /dev/null
@@ -1,35 +0,0 @@
-import $ from 'jquery';
-import VersionCheckImage from '~/version_check_image';
-import ClassSpecHelper from './helpers/class_spec_helper';
-
-describe('VersionCheckImage', function() {
-  describe('bindErrorEvent', function() {
-    ClassSpecHelper.itShouldBeAStaticMethod(VersionCheckImage, 'bindErrorEvent');
-
-    beforeEach(function() {
-      this.imageElement = $('<div></div>');
-    });
-
-    it('registers an error event', function() {
-      spyOn($.prototype, 'on');
-      spyOn($.prototype, 'off').and.callFake(function() {
-        return this;
-      });
-
-      VersionCheckImage.bindErrorEvent(this.imageElement);
-
-      expect($.prototype.off).toHaveBeenCalledWith('error');
-      expect($.prototype.on).toHaveBeenCalledWith('error', jasmine.any(Function));
-    });
-
-    it('hides the imageElement on error', function() {
-      spyOn($.prototype, 'hide');
-
-      VersionCheckImage.bindErrorEvent(this.imageElement);
-
-      this.imageElement.trigger('error');
-
-      expect($.prototype.hide).toHaveBeenCalled();
-    });
-  });
-});
diff --git a/spec/lib/sentry/client/issue_spec.rb b/spec/lib/sentry/client/issue_spec.rb
index 17548e2081d..20665c59a8d 100644
--- a/spec/lib/sentry/client/issue_spec.rb
+++ b/spec/lib/sentry/client/issue_spec.rb
@@ -74,6 +74,10 @@ describe Sentry::Client::Issue do
       it 'has a correct GitLab issue url' do
         expect(subject.gitlab_issue).to eq('https://gitlab.com/gitlab-org/gitlab/issues/1')
       end
+
+      it 'has the correct tags' do
+        expect(subject.tags).to eq({ level: issue_sample_response['level'], logger: issue_sample_response['logger'] })
+      end
     end
   end
 end
diff --git a/spec/models/project_services/chat_message/wiki_page_message_spec.rb b/spec/models/project_services/chat_message/wiki_page_message_spec.rb
index c3db516f253..1346a43335e 100644
--- a/spec/models/project_services/chat_message/wiki_page_message_spec.rb
+++ b/spec/models/project_services/chat_message/wiki_page_message_spec.rb
@@ -17,7 +17,8 @@ describe ChatMessage::WikiPageMessage do
       object_attributes: {
         title: 'Wiki page title',
         url: 'http://url.com',
-        content: 'Wiki page description'
+        content: 'Wiki page content',
+        message: 'Wiki page commit message'
       }
     }
   end
@@ -57,10 +58,10 @@ describe ChatMessage::WikiPageMessage do
           args[:object_attributes][:action] = 'create'
         end
 
-        it 'returns the attachment for a new wiki page' do
+        it 'returns the commit message for a new wiki page' do
           expect(subject.attachments).to eq([
             {
-              text: "Wiki page description",
+              text: "Wiki page commit message",
               color: color
             }
           ])
@@ -72,10 +73,10 @@ describe ChatMessage::WikiPageMessage do
           args[:object_attributes][:action] = 'update'
         end
 
-        it 'returns the attachment for an updated wiki page' do
+        it 'returns the commit message for an updated wiki page' do
           expect(subject.attachments).to eq([
             {
-              text: "Wiki page description",
+              text: "Wiki page commit message",
               color: color
             }
           ])
@@ -119,8 +120,8 @@ describe ChatMessage::WikiPageMessage do
           args[:object_attributes][:action] = 'create'
         end
 
-        it 'returns the attachment for a new wiki page' do
-          expect(subject.attachments).to eq('Wiki page description')
+        it 'returns the commit message for a new wiki page' do
+          expect(subject.attachments).to eq('Wiki page commit message')
         end
       end
 
@@ -129,8 +130,8 @@ describe ChatMessage::WikiPageMessage do
           args[:object_attributes][:action] = 'update'
         end
 
-        it 'returns the attachment for an updated wiki page' do
-          expect(subject.attachments).to eq('Wiki page description')
+        it 'returns the commit message for an updated wiki page' do
+          expect(subject.attachments).to eq('Wiki page commit message')
         end
       end
     end