1 files changed, 125 insertions, 1 deletions
diff --git a/spec/javascripts/diffs/components/compare_versions_spec.js b/spec/javascripts/diffs/components/compare_versions_spec.js
index 7237274eb43..d9d7f61785f 100644
--- a/spec/javascripts/diffs/components/compare_versions_spec.js
+++ b/spec/javascripts/diffs/components/compare_versions_spec.js
@@ -1 +1,125 @@
-// TODO: https://gitlab.com/gitlab-org/gitlab-ce/issues/48034
+import Vue from 'vue';
+import CompareVersionsComponent from '~/diffs/components/compare_versions.vue';
+import store from '~/mr_notes/stores';
+import { createComponentWithStore } from 'spec/helpers/vue_mount_component_helper';
+import diffsMockData from '../mock_data/merge_request_diffs';
+
+describe('CompareVersions', () => {
+  let vm;
+  const targetBranch = { branchName: 'tmp-wine-dev', versionIndex: -1 };
+
+  beforeEach(() => {
+    vm = createComponentWithStore(Vue.extend(CompareVersionsComponent), store, {
+      mergeRequestDiffs: diffsMockData,
+      mergeRequestDiff: diffsMockData[0],
+      targetBranch,
+    }).$mount();
+  });
+
+  describe('template', () => {
+    it('should render Tree List toggle button with correct attribute values', () => {
+      const treeListBtn = vm.$el.querySelector('.js-toggle-tree-list');
+
+      expect(treeListBtn).not.toBeNull();
+      expect(treeListBtn.dataset.originalTitle).toBe('Toggle file browser');
+      expect(treeListBtn.querySelectorAll('svg use').length).not.toBe(0);
+      expect(treeListBtn.querySelector('svg use').getAttribute('xlink:href')).toContain(
+        '#hamburger',
+      );
+    });
+
+    it('should render comparison dropdowns with correct values', () => {
+      const sourceDropdown = vm.$el.querySelector('.mr-version-dropdown');
+      const targetDropdown = vm.$el.querySelector('.mr-version-compare-dropdown');
+
+      expect(sourceDropdown).not.toBeNull();
+      expect(targetDropdown).not.toBeNull();
+      expect(sourceDropdown.querySelector('a span').innerHTML).toContain('latest version');
+      expect(targetDropdown.querySelector('a span').innerHTML).toContain(targetBranch.branchName);
+    });
+
+    it('should not render comparison dropdowns if no mergeRequestDiffs are specified', () => {
+      vm.mergeRequestDiffs = [];
+
+      vm.$nextTick(() => {
+        const sourceDropdown = vm.$el.querySelector('.mr-version-dropdown');
+        const targetDropdown = vm.$el.querySelector('.mr-version-compare-dropdown');
+
+        expect(sourceDropdown).toBeNull();
+        expect(targetDropdown).toBeNull();
+      });
+    });
+
+    it('should render whitespace toggle button with correct attributes', () => {
+      const whitespaceBtn = vm.$el.querySelector('.qa-toggle-whitespace');
+      const href = vm.toggleWhitespacePath;
+
+      expect(whitespaceBtn).not.toBeNull();
+      expect(whitespaceBtn.getAttribute('href')).toEqual(href);
+      expect(whitespaceBtn.innerHTML).toContain('Hide whitespace changes');
+    });
+
+    it('should render view types buttons with correct values', () => {
+      const inlineBtn = vm.$el.querySelector('#inline-diff-btn');
+      const parallelBtn = vm.$el.querySelector('#parallel-diff-btn');
+
+      expect(inlineBtn).not.toBeNull();
+      expect(parallelBtn).not.toBeNull();
+      expect(inlineBtn.dataset.viewType).toEqual('inline');
+      expect(parallelBtn.dataset.viewType).toEqual('parallel');
+      expect(inlineBtn.innerHTML).toContain('Inline');
+      expect(parallelBtn.innerHTML).toContain('Side-by-side');
+    });
+  });
+
+  describe('setInlineDiffViewType', () => {
+    it('should persist the view type in the url', () => {
+      const viewTypeBtn = vm.$el.querySelector('#inline-diff-btn');
+      viewTypeBtn.click();
+
+      expect(window.location.toString()).toContain('?view=inline');
+    });
+  });
+
+  describe('setParallelDiffViewType', () => {
+    it('should persist the view type in the url', () => {
+      const viewTypeBtn = vm.$el.querySelector('#parallel-diff-btn');
+      viewTypeBtn.click();
+
+      expect(window.location.toString()).toContain('?view=parallel');
+    });
+  });
+
+  describe('comparableDiffs', () => {
+    it('should not contain the first item in the mergeRequestDiffs property', () => {
+      const { comparableDiffs } = vm;
+      const comparableDiffsMock = diffsMockData.slice(1);
+
+      expect(comparableDiffs).toEqual(comparableDiffsMock);
+    });
+  });
+
+  describe('isWhitespaceVisible', () => {
+    const originalHref = window.location.href;
+
+    afterEach(() => {
+      window.history.replaceState({}, null, originalHref);
+    });
+
+    it('should return "true" when no "w" flag is present in the URL (default)', () => {
+      expect(vm.isWhitespaceVisible()).toBe(true);
+    });
+
+    it('should return "false" when the flag is set to "1" in the URL', () => {
+      window.history.replaceState({}, null, '?w=1');
+
+      expect(vm.isWhitespaceVisible()).toBe(false);
+    });
+
+    it('should return "true" when the flag is set to "0" in the URL', () => {
+      window.history.replaceState({}, null, '?w=0');
+
+      expect(vm.isWhitespaceVisible()).toBe(true);
+    });
+  });
+});