Fixed JS tests

app/assets/javascripts/boards/models/assignee.js

 /* eslint-disable no-unused-vars */
 
 class ListAssignee {
-  constructor(user) {
+  constructor(user, defaultAvatar) {
     this.id = user.id;
     this.name = user.name;
     this.username = user.username;
-    this.avatar = user.avatar_url;
+    this.avatar = user.avatar_url || defaultAvatar;
   }
 }
 

spec/javascripts/boards/issue_card_spec.js

@@ -237,75 +237,6 @@ describe('Issue card component', () => {
     });
   });
 
-  describe('multiple assignees', () => {
-    beforeEach((done) => {
-      component.issue.assignees = [
-        user,
-        new ListAssignee({
-          id: 2,
-          name: 'user2',
-          username: 'user2',
-          avatar: 'test_image',
-        }),
-        new ListAssignee({
-          id: 3,
-          name: 'user3',
-          username: 'user3',
-          avatar: 'test_image',
-        }),
-        new ListAssignee({
-          id: 4,
-          name: 'user4',
-          username: 'user4',
-          avatar: 'test_image',
-        })];
-
-      Vue.nextTick(() => done());
-    });
-
-    it('renders all four assignees', () => {
-      expect(component.$el.querySelectorAll('.card-assignee .avatar').length).toEqual(4);
-    });
-
-    describe('more than four assignees', () => {
-      beforeEach((done) => {
-        component.issue.assignees.push(new ListAssignee({
-          id: 5,
-          name: 'user5',
-          username: 'user5',
-          avatar: 'test_image',
-        }));
-
-        Vue.nextTick(() => done());
-      });
-
-      it('renders more avatar counter', () => {
-        expect(component.$el.querySelector('.card-assignee .avatar-counter').innerText).toEqual('+2');
-      });
-
-      it('renders three assignees', () => {
-        expect(component.$el.querySelectorAll('.card-assignee .avatar').length).toEqual(3);
-      });
-
-      it('renders 99+ avatar counter', (done) => {
-        for (let i = 5; i < 104; i += 1) {
-          const u = new ListAssignee({
-            id: i,
-            name: 'name',
-            username: 'username',
-            avatar: 'test_image',
-          });
-          component.issue.assignees.push(u);
-        }
-
-        Vue.nextTick(() => {
-          expect(component.$el.querySelector('.card-assignee .avatar-counter').innerText).toEqual('99+');
-          done();
-        });
-      });
-    });
-  });
-
   describe('labels', () => {
     it('does not render any', () => {
       expect(