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diff --git a/spec/javascripts/sidebar/assignees_spec.js b/spec/javascripts/sidebar/assignees_spec.js
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+++ b/spec/javascripts/sidebar/assignees_spec.js
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+import Vue from 'vue';
+import Assignee from '~/sidebar/components/assignees/assignees';
+import UsersMock from './mock_data';
+import UsersMockHelper from '../helpers/user_mock_data_helper';
+
+describe('Assignee component', () => {
+  let component;
+  let AssigneeComponent;
+
+  beforeEach(() => {
+    AssigneeComponent = Vue.extend(Assignee);
+  });
+
+  describe('No assignees/users', () => {
+    it('displays no assignee icon when collapsed', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      expect(collapsed.childElementCount).toEqual(1);
+      expect(collapsed.children[0].getAttribute('aria-label')).toEqual('No Assignee');
+      expect(collapsed.children[0].classList.contains('fa')).toEqual(true);
+      expect(collapsed.children[0].classList.contains('fa-user')).toEqual(true);
+    });
+
+    it('displays only "No assignee" when no users are assigned and the issue is read-only', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: false,
+        },
+      }).$mount();
+      const componentTextNoUsers = component.$el.querySelector('.assign-yourself').innerText.trim();
+
+      expect(componentTextNoUsers).toBe('No assignee');
+      expect(componentTextNoUsers.indexOf('assign yourself')).toEqual(-1);
+    });
+
+    it('displays only "No assignee" when no users are assigned and the issue can be edited', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: true,
+        },
+      }).$mount();
+      const componentTextNoUsers = component.$el.querySelector('.assign-yourself').innerText.trim();
+
+      expect(componentTextNoUsers.indexOf('No assignee')).toEqual(0);
+      expect(componentTextNoUsers.indexOf('assign yourself')).toBeGreaterThan(0);
+    });
+
+    it('emits the assign-self event when "assign yourself" is clicked', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: true,
+        },
+      }).$mount();
+
+      spyOn(component, '$emit');
+      component.$el.querySelector('.assign-yourself .btn-link').click();
+      expect(component.$emit).toHaveBeenCalledWith('assign-self');
+    });
+  });
+
+  describe('One assignee/user', () => {
+    it('displays one assignee icon when collapsed', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [
+            UsersMock.user,
+          ],
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      const assignee = collapsed.children[0];
+      expect(collapsed.childElementCount).toEqual(1);
+      expect(assignee.querySelector('.avatar').getAttribute('src')).toEqual(UsersMock.user.avatar);
+      expect(assignee.querySelector('.avatar').getAttribute('alt')).toEqual(`${UsersMock.user.name}'s avatar`);
+      expect(assignee.querySelector('.author').innerText.trim()).toEqual(UsersMock.user.name);
+    });
+
+    it('Shows one user with avatar, username and author name', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000/',
+          users: [
+            UsersMock.user,
+          ],
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.$el.querySelector('.author_link')).not.toBeNull();
+      // The image
+      expect(component.$el.querySelector('.author_link img').getAttribute('src')).toEqual(UsersMock.user.avatar);
+      // Author name
+      expect(component.$el.querySelector('.author_link .author').innerText.trim()).toEqual(UsersMock.user.name);
+      // Username
+      expect(component.$el.querySelector('.author_link .username').innerText.trim()).toEqual(`@${UsersMock.user.username}`);
+    });
+
+    it('has the root url present in the assigneeUrl method', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000/',
+          users: [
+            UsersMock.user,
+          ],
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.assigneeUrl(UsersMock.user).indexOf('http://localhost:3000/')).not.toEqual(-1);
+    });
+  });
+
+  describe('Two or more assignees/users', () => {
+    it('displays two assignee icons when collapsed', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(2);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      expect(collapsed.childElementCount).toEqual(2);
+
+      const first = collapsed.children[0];
+      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatar);
+      expect(first.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[0].name}'s avatar`);
+      expect(first.querySelector('.author').innerText.trim()).toEqual(users[0].name);
+
+      const second = collapsed.children[1];
+      expect(second.querySelector('.avatar').getAttribute('src')).toEqual(users[1].avatar);
+      expect(second.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[1].name}'s avatar`);
+      expect(second.querySelector('.author').innerText.trim()).toEqual(users[1].name);
+    });
+
+    it('displays one assignee icon and counter when collapsed', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(3);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      expect(collapsed.childElementCount).toEqual(2);
+
+      const first = collapsed.children[0];
+      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatar);
+      expect(first.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[0].name}'s avatar`);
+      expect(first.querySelector('.author').innerText.trim()).toEqual(users[0].name);
+
+      const second = collapsed.children[1];
+      expect(second.querySelector('.avatar-counter').innerText.trim()).toEqual('+2');
+    });
+
+    it('Shows two assignees', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(2);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.$el.querySelectorAll('.user-item').length).toEqual(users.length);
+      expect(component.$el.querySelector('.user-list-more')).toBe(null);
+    });
+
+    it('Shows the "show-less" assignees label', (done) => {
+      const users = UsersMockHelper.createNumberRandomUsers(6);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.$el.querySelectorAll('.user-item').length).toEqual(component.defaultRenderCount);
+      expect(component.$el.querySelector('.user-list-more')).not.toBe(null);
+      const usersLabelExpectation = users.length - component.defaultRenderCount;
+      expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+        .not.toBe(`+${usersLabelExpectation} more`);
+      component.toggleShowLess();
+      Vue.nextTick(() => {
+        expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+          .toBe('- show less');
+        done();
+      });
+    });
+
+    it('Shows the "show-less" when "n+ more " label is clicked', (done) => {
+      const users = UsersMockHelper.createNumberRandomUsers(6);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      component.$el.querySelector('.user-list-more .btn-link').click();
+      Vue.nextTick(() => {
+        expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+          .toBe('- show less');
+        done();
+      });
+    });
+
+    it('gets the count of avatar via a computed property ', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(6);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.sidebarAvatarCounter).toEqual(`+${users.length - 1}`);
+    });
+
+    describe('n+ more label', () => {
+      beforeEach(() => {
+        const users = UsersMockHelper.createNumberRandomUsers(6);
+        component = new AssigneeComponent({
+          propsData: {
+            rootPath: 'http://localhost:3000',
+            users,
+            editable: true,
+          },
+        }).$mount();
+      });
+
+      it('shows "+1 more" label', () => {
+        expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+          .toBe('+ 1 more');
+      });
+
+      it('shows "show less" label', (done) => {
+        component.toggleShowLess();
+
+        Vue.nextTick(() => {
+          expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+            .toBe('- show less');
+          done();
+        });
+      });
+    });
+  });
+});