Change fixture from issue to merge request index

When the `vue_issues_list` feature flag defaults to true,
the frontend tests using the issues index fixture will
no longer work. This commit changes the tests to use
a merge request index fixture instead so it will
continue to work.

spec/frontend/filtered_search/dropdown_user_spec.js

@@ -74,7 +74,7 @@ describe('Dropdown User', () => {
   });
 
   describe('hideCurrentUser', () => {
-    const fixtureTemplate = 'issues/issue_list.html';
+    const fixtureTemplate = 'merge_requests/merge_request_list.html';
 
     let dropdown;
     let authorFilterDropdownElement;

spec/frontend/filtered_search/dropdown_utils_spec.js

@@ -4,7 +4,7 @@ import FilteredSearchDropdownManager from '~/filtered_search/filtered_search_dro
 import IssuableFilteredSearchTokenKeys from '~/filtered_search/issuable_filtered_search_token_keys';
 
 describe('Dropdown Utils', () => {
-  const issueListFixture = 'issues/issue_list.html';
+  const issuableListFixture = 'merge_requests/merge_request_list.html';
 
   describe('getEscapedText', () => {
     it('should return same word when it has no space', () => {
@@ -350,7 +350,7 @@ describe('Dropdown Utils', () => {
     let authorToken;
 
     beforeEach(() => {
-      loadFixtures(issueListFixture);
+      loadFixtures(issuableListFixture);
 
       authorToken = FilteredSearchSpecHelper.createFilterVisualToken('author', '=', '@user');
       const searchTermToken = FilteredSearchSpecHelper.createSearchVisualToken('search term');

spec/frontend/fixtures/issues.rb

@@ -37,17 +37,6 @@ RSpec.describe Projects::IssuesController, '(JavaScript fixtures)', type: :contr
     render_issue(create(:closed_issue, project: project))
   end
 
-  it 'issues/issue_list.html' do
-    create(:issue, project: project)
-
-    get :index, params: {
-      namespace_id: project.namespace.to_param,
-      project_id: project
-    }
-
-    expect(response).to be_successful
-  end
-
   private
 
   def render_issue(issue)

spec/frontend/fixtures/merge_requests.rb

@@ -119,6 +119,17 @@ RSpec.describe Projects::MergeRequestsController, '(JavaScript fixtures)', type:
     end
   end
 
+  it 'merge_requests/merge_request_list.html' do
+    create(:merge_request, source_project: project, target_project: project)
+
+    get :index, params: {
+      namespace_id: project.namespace.to_param,
+      project_id: project
+    }
+
+    expect(response).to be_successful
+  end
+
   private
 
   def render_discussions_json(merge_request)