Fixed duplicate jQuery AJAX spyon

app/assets/javascripts/merge_request_tabs.js

@@ -102,10 +102,10 @@ import './flash';
 
     destroyPipelinesView() {
       if (this.commitPipelinesTable) {
-        document.querySelector('#commit-pipeline-table-view')
-          .removeChild(this.commitPipelinesTable.$el);
-
         this.commitPipelinesTable.$destroy();
+        this.commitPipelinesTable = null;
+
+        document.querySelector('#commit-pipeline-table-view').innerHTML = '';
       }
     }
 

spec/javascripts/merge_request_tabs_spec.js

@@ -222,7 +222,9 @@ require('vendor/jquery.scrollTo');
 
     describe('#tabShown', () => {
       beforeEach(function () {
-        spyOn($, 'ajax').and.callFake(function () {});
+        spyOn($, 'ajax').and.callFake(function (options) {
+          options.success({ html: '' });
+        });
         loadFixtures('merge_requests/merge_request_with_task_list.html.raw');
       });
 
@@ -230,9 +232,6 @@ require('vendor/jquery.scrollTo');
         beforeEach(function () {
           this.class.diffViewType = () => 'parallel';
           gl.Diff.prototype.diffViewType = () => 'parallel';
-          spyOn($, 'ajax').and.callFake(function (options) {
-            options.success({ html: '' });
-          });
         });
 
         it('maintains `container-limited` for pipelines tab', function (done) {