Emit `toggleSubscription`, `toggleSidebar` events on component

app/assets/javascripts/sidebar/components/subscriptions/subscriptions.vue

@@ -47,8 +47,25 @@
       },
     },
     methods: {
+      /**
+       * We need to emit this event on both component & eventHub
+       * for 2 dependencies;
+       *
+       * 1. eventHub: This component is used in Issue Boards sidebar
+       *              where component template is part of HAML
+       *              and event listeners are tied to app's eventHub.
+       * 2. Component: This compone is also used in Epics in EE
+       *               where listeners are tied to component event.
+       */
       toggleSubscription() {
+        // App's eventHub event emission.
         eventHub.$emit('toggleSubscription', this.id);
+
+        // Component event emission.
+        this.$emit('toggleSubscription', this.id);
+      },
+      onClickCollapsedIcon() {
+        this.$emit('toggleSidebar');
       },
     },
   };
@@ -56,7 +73,10 @@
 
 <template>
   <div>
-    <div class="sidebar-collapsed-icon">
+    <div
+      class="sidebar-collapsed-icon"
+      @click="onClickCollapsedIcon"
+    >
       <span
         v-tooltip
         :title="notificationTooltip"

spec/javascripts/sidebar/subscriptions_spec.js

 import Vue from 'vue';
 import subscriptions from '~/sidebar/components/subscriptions/subscriptions.vue';
+import eventHub from '~/sidebar/event_hub';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 
 describe('Subscriptions', function () {
@@ -39,4 +40,22 @@ describe('Subscriptions', function () {
 
     expect(vm.$refs.toggleButton.$el.querySelector('.project-feature-toggle')).toHaveClass('is-checked');
   });
+
+  it('toggleSubscription method emits `toggleSubscription` event on eventHub and Component', () => {
+    vm = mountComponent(Subscriptions, { subscribed: true });
+    spyOn(eventHub, '$emit');
+    spyOn(vm, '$emit');
+
+    vm.toggleSubscription();
+    expect(eventHub.$emit).toHaveBeenCalledWith('toggleSubscription', jasmine.any(Object));
+    expect(vm.$emit).toHaveBeenCalledWith('toggleSubscription', jasmine.any(Object));
+  });
+
+  it('onClickCollapsedIcon method emits `toggleSidebar` event on component', () => {
+    vm = mountComponent(Subscriptions, { subscribed: true });
+    spyOn(vm, '$emit');
+
+    vm.onClickCollapsedIcon();
+    expect(vm.$emit).toHaveBeenCalledWith('toggleSidebar');
+  });
 });