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diff --git a/spec/frontend/boards/components/sidebar/board_sidebar_subscription_spec.js b/spec/frontend/boards/components/sidebar/board_sidebar_subscription_spec.js
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+++ b/spec/frontend/boards/components/sidebar/board_sidebar_subscription_spec.js
@@ -0,0 +1,157 @@
+import Vuex from 'vuex';
+import { mount, createLocalVue } from '@vue/test-utils';
+import { GlToggle, GlLoadingIcon } from '@gitlab/ui';
+import BoardSidebarSubscription from '~/boards/components/sidebar/board_sidebar_subscription.vue';
+import * as types from '~/boards/stores/mutation_types';
+import { createStore } from '~/boards/stores';
+import { mockActiveIssue } from '../../mock_data';
+import createFlash from '~/flash';
+
+jest.mock('~/flash.js');
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('~/boards/components/sidebar/board_sidebar_subscription_spec.vue', () => {
+  let wrapper;
+  let store;
+
+  const findNotificationHeader = () => wrapper.find("[data-testid='notification-header-text']");
+  const findToggle = () => wrapper.find(GlToggle);
+  const findGlLoadingIcon = () => wrapper.find(GlLoadingIcon);
+
+  const createComponent = (activeIssue = { ...mockActiveIssue }) => {
+    store = createStore();
+    store.state.issues = { [activeIssue.id]: activeIssue };
+    store.state.activeId = activeIssue.id;
+
+    wrapper = mount(BoardSidebarSubscription, {
+      localVue,
+      store,
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+    store = null;
+    jest.clearAllMocks();
+  });
+
+  describe('Board sidebar subscription component template', () => {
+    it('displays "notifications" heading', () => {
+      createComponent();
+
+      expect(findNotificationHeader().text()).toBe('Notifications');
+    });
+
+    it('renders toggle as "off" when currently not subscribed', () => {
+      createComponent();
+
+      expect(findToggle().exists()).toBe(true);
+      expect(findToggle().props('value')).toBe(false);
+    });
+
+    it('renders toggle as "on" when currently subscribed', () => {
+      createComponent({
+        ...mockActiveIssue,
+        subscribed: true,
+      });
+
+      expect(findToggle().exists()).toBe(true);
+      expect(findToggle().props('value')).toBe(true);
+    });
+
+    describe('when notification emails have been disabled', () => {
+      beforeEach(() => {
+        createComponent({
+          ...mockActiveIssue,
+          emailsDisabled: true,
+        });
+      });
+
+      it('displays a message that notification have been disabled', () => {
+        expect(findNotificationHeader().text()).toBe(
+          'Notifications have been disabled by the project or group owner',
+        );
+      });
+
+      it('does not render the toggle button', () => {
+        expect(findToggle().exists()).toBe(false);
+      });
+    });
+  });
+
+  describe('Board sidebar subscription component `behavior`', () => {
+    const mockSetActiveIssueSubscribed = subscribedState => {
+      jest.spyOn(wrapper.vm, 'setActiveIssueSubscribed').mockImplementation(async () => {
+        store.commit(types.UPDATE_ISSUE_BY_ID, {
+          issueId: mockActiveIssue.id,
+          prop: 'subscribed',
+          value: subscribedState,
+        });
+      });
+    };
+
+    it('subscribing to notification', async () => {
+      createComponent();
+      mockSetActiveIssueSubscribed(true);
+
+      expect(findGlLoadingIcon().exists()).toBe(false);
+
+      findToggle().trigger('click');
+
+      await wrapper.vm.$nextTick();
+
+      expect(findGlLoadingIcon().exists()).toBe(true);
+      expect(wrapper.vm.setActiveIssueSubscribed).toHaveBeenCalledWith({
+        subscribed: true,
+        projectPath: 'gitlab-org/test-subgroup/gitlab-test',
+      });
+
+      await wrapper.vm.$nextTick();
+
+      expect(findGlLoadingIcon().exists()).toBe(false);
+      expect(findToggle().props('value')).toBe(true);
+    });
+
+    it('unsubscribing from notification', async () => {
+      createComponent({
+        ...mockActiveIssue,
+        subscribed: true,
+      });
+      mockSetActiveIssueSubscribed(false);
+
+      expect(findGlLoadingIcon().exists()).toBe(false);
+
+      findToggle().trigger('click');
+
+      await wrapper.vm.$nextTick();
+
+      expect(wrapper.vm.setActiveIssueSubscribed).toHaveBeenCalledWith({
+        subscribed: false,
+        projectPath: 'gitlab-org/test-subgroup/gitlab-test',
+      });
+      expect(findGlLoadingIcon().exists()).toBe(true);
+
+      await wrapper.vm.$nextTick();
+
+      expect(findGlLoadingIcon().exists()).toBe(false);
+      expect(findToggle().props('value')).toBe(false);
+    });
+
+    it('flashes an error message when setting the subscribed state fails', async () => {
+      createComponent();
+      jest.spyOn(wrapper.vm, 'setActiveIssueSubscribed').mockImplementation(async () => {
+        throw new Error();
+      });
+
+      findToggle().trigger('click');
+
+      await wrapper.vm.$nextTick();
+      expect(createFlash).toHaveBeenNthCalledWith(1, {
+        message: wrapper.vm.$options.i18n.updateSubscribedErrorMessage,
+      });
+    });
+  });
+});