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diff --git a/spec/frontend/sidebar/components/subscriptions/sidebar_subscriptions_widget_spec.js b/spec/frontend/sidebar/components/subscriptions/sidebar_subscriptions_widget_spec.js
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+++ b/spec/frontend/sidebar/components/subscriptions/sidebar_subscriptions_widget_spec.js
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+import { GlIcon, GlToggle } from '@gitlab/ui';
+import { shallowMount } from '@vue/test-utils';
+import Vue from 'vue';
+import VueApollo from 'vue-apollo';
+import createMockApollo from 'helpers/mock_apollo_helper';
+import waitForPromises from 'helpers/wait_for_promises';
+import createFlash from '~/flash';
+import SidebarEditableItem from '~/sidebar/components/sidebar_editable_item.vue';
+import SidebarSubscriptionWidget from '~/sidebar/components/subscriptions/sidebar_subscriptions_widget.vue';
+import issueSubscribedQuery from '~/sidebar/queries/issue_subscribed.query.graphql';
+import { issueSubscriptionsResponse } from '../../mock_data';
+
+jest.mock('~/flash');
+
+Vue.use(VueApollo);
+
+describe('Sidebar Subscriptions Widget', () => {
+  let wrapper;
+  let fakeApollo;
+
+  const findEditableItem = () => wrapper.findComponent(SidebarEditableItem);
+  const findToggle = () => wrapper.findComponent(GlToggle);
+  const findIcon = () => wrapper.findComponent(GlIcon);
+
+  const createComponent = ({
+    subscriptionsQueryHandler = jest.fn().mockResolvedValue(issueSubscriptionsResponse()),
+  } = {}) => {
+    fakeApollo = createMockApollo([[issueSubscribedQuery, subscriptionsQueryHandler]]);
+
+    wrapper = shallowMount(SidebarSubscriptionWidget, {
+      apolloProvider: fakeApollo,
+      provide: {
+        canUpdate: true,
+      },
+      propsData: {
+        fullPath: 'group/project',
+        iid: '1',
+        issuableType: 'issue',
+      },
+      stubs: {
+        SidebarEditableItem,
+      },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    fakeApollo = null;
+  });
+
+  it('passes a `loading` prop as true to editable item when query is loading', () => {
+    createComponent();
+
+    expect(findEditableItem().props('loading')).toBe(true);
+  });
+
+  describe('when user is not subscribed to the issue', () => {
+    beforeEach(() => {
+      createComponent();
+      return waitForPromises();
+    });
+
+    it('passes a `loading` prop as false to editable item', () => {
+      expect(findEditableItem().props('loading')).toBe(false);
+    });
+
+    it('toggle is unchecked', () => {
+      expect(findToggle().props('value')).toBe(false);
+    });
+
+    it('emits `subscribedUpdated` event with a `false` payload', () => {
+      expect(wrapper.emitted('subscribedUpdated')).toEqual([[false]]);
+    });
+  });
+
+  describe('when user is subscribed to the issue', () => {
+    beforeEach(() => {
+      createComponent({
+        subscriptionsQueryHandler: jest.fn().mockResolvedValue(issueSubscriptionsResponse(true)),
+      });
+      return waitForPromises();
+    });
+
+    it('passes a `loading` prop as false to editable item', () => {
+      expect(findEditableItem().props('loading')).toBe(false);
+    });
+
+    it('toggle is checked', () => {
+      expect(findToggle().props('value')).toBe(true);
+    });
+
+    it('emits `subscribedUpdated` event with a `true` payload', () => {
+      expect(wrapper.emitted('subscribedUpdated')).toEqual([[true]]);
+    });
+  });
+
+  describe('when emails are disabled', () => {
+    it('toggle is disabled and off when user is subscribed', async () => {
+      createComponent({
+        subscriptionsQueryHandler: jest
+          .fn()
+          .mockResolvedValue(issueSubscriptionsResponse(true, true)),
+      });
+      await waitForPromises();
+
+      expect(findIcon().props('name')).toBe('notifications-off');
+      expect(findToggle().props('disabled')).toBe(true);
+    });
+
+    it('toggle is disabled and off when user is not subscribed', async () => {
+      createComponent({
+        subscriptionsQueryHandler: jest
+          .fn()
+          .mockResolvedValue(issueSubscriptionsResponse(false, true)),
+      });
+      await waitForPromises();
+
+      expect(findIcon().props('name')).toBe('notifications-off');
+      expect(findToggle().props('disabled')).toBe(true);
+    });
+  });
+
+  it('displays a flash message when query is rejected', async () => {
+    createComponent({
+      subscriptionsQueryHandler: jest.fn().mockRejectedValue('Houston, we have a problem'),
+    });
+    await waitForPromises();
+
+    expect(createFlash).toHaveBeenCalled();
+  });
+});