backport fixes for pipelines_store frontend specs

app/assets/javascripts/commit/pipelines/pipelines_store.js.es6

@@ -26,7 +26,7 @@ class PipelinesStore {
    */
   startTimeAgoLoops() {
     const startTimeLoops = () => {
-      this.timeLoopInterval = setInterval(function timeloopInterval() {
+      this.timeLoopInterval = setInterval(() => {
         this.$children[0].$children.reduce((acc, component) => {
           const timeAgoComponent = component.$children.filter(el => el.$options._componentTag === 'time-ago')[0];
           acc.push(timeAgoComponent);

app/assets/javascripts/vue_realtime_listener/index.js.es6

@@ -14,5 +14,16 @@
     window.addEventListener('focus', startIntervals);
     window.addEventListener('blur', removeIntervals);
     document.addEventListener('beforeunload', removeAll);
+
+    // add removeAll methods to stack
+    const stack = gl.VueRealtimeListener.reset;
+    gl.VueRealtimeListener.reset = () => {
+      gl.VueRealtimeListener.reset = stack;
+      removeAll();
+      stack();
+    };
   };
+
+  // remove all event listeners and intervals
+  gl.VueRealtimeListener.reset = () => undefined; // noop
 })(window.gl || (window.gl = {}));

spec/javascripts/commit/pipelines/pipelines_store_spec.js.es6

@@ -7,6 +7,9 @@ describe('Store', () => {
     store = new gl.commits.pipelines.PipelinesStore();
   });
 
+  // unregister intervals and event handlers
+  afterEach(() => gl.VueRealtimeListener.reset());
+
   it('should start with a blank state', () => {
     expect(store.state.pipelines.length).toBe(0);
   });