Remove scroll fade tests from boards_selector_spec.js

ee/spec/javascripts/boards/components/boards_selector_spec.js

 import Vue from 'vue';
 import BoardService from 'ee/boards/services/board_service';
 import BoardsSelector from 'ee/boards/components/boards_selector.vue';
-import setTimeoutPromiseHelper from 'spec/helpers/set_timeout_promise_helper';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 import { TEST_HOST } from 'spec/test_constants';
 
 const throttleDuration = 1;
 
-function waitForScroll() {
-  return Vue.nextTick()
-    .then(() => setTimeoutPromiseHelper(throttleDuration))
-    .then(() => Vue.nextTick());
-}
-
 describe('BoardsSelector', () => {
   let vm;
-  let scrollContainer;
-  let scrollFade;
   let boardServiceResponse;
   const boards = new Array(20).fill().map((board, id) => {
     const name = `board${id}`;
@@ -75,13 +66,6 @@ describe('BoardsSelector', () => {
 
     boardServiceResponse
       .then(() => vm.$nextTick())
-      .then(() => {
-        scrollFade = vm.$el.querySelector('.js-scroll-fade');
-        scrollContainer = scrollFade.querySelector('.js-dropdown-list');
-
-        scrollContainer.style.maxHeight = '100px';
-        scrollContainer.style.overflowY = 'scroll';
-      })
       .then(done)
       .catch(done.fail);
   });
@@ -91,29 +75,6 @@ describe('BoardsSelector', () => {
     window.gl.boardService = undefined;
   });
 
-  it('shows the scroll fade if isScrolledUp', done => {
-    vm.scrollFadeInitialized = false;
-    scrollContainer.scrollTop = 0;
-
-    waitForScroll()
-      .then(() => {
-        expect(scrollFade.classList.contains('fade-out')).toEqual(false);
-      })
-      .then(done)
-      .catch(done.fail);
-  });
-
-  it('hides the scroll fade if not isScrolledUp', done => {
-    scrollContainer.scrollTop = scrollContainer.scrollHeight;
-
-    waitForScroll()
-      .then(() => {
-        expect(scrollFade.classList.contains('fade-out')).toEqual(true);
-      })
-      .then(done)
-      .catch(done.fail);
-  });
-
   describe('filtering', () => {
     const fillSearchBox = filterTerm => {
       const { searchBox } = vm.$refs;
@@ -122,10 +83,15 @@ describe('BoardsSelector', () => {
       searchBoxInput.dispatchEvent(new Event('input'));
     };
 
-    it('shows all boards without filtering', () => {
+    it('shows all boards without filtering', done => {
+      vm.$nextTick()
+        .then(() => {
           const dropdownItemCount = vm.$el.querySelectorAll('.js-dropdown-item');
 
           expect(dropdownItemCount.length).toBe(boards.length);
+        })
+        .then(done)
+        .catch(done.fail);
     });
 
     it('shows only matching boards when filtering', done => {