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diff --git a/spec/frontend/issuable_show/components/issuable_header_spec.js b/spec/frontend/issuable_show/components/issuable_header_spec.js
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+++ b/spec/frontend/issuable_show/components/issuable_header_spec.js
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+import { shallowMount } from '@vue/test-utils';
+import { GlIcon, GlAvatarLabeled } from '@gitlab/ui';
+
+import IssuableHeader from '~/issuable_show/components/issuable_header.vue';
+
+import { mockIssuableShowProps, mockIssuable } from '../mock_data';
+
+const issuableHeaderProps = {
+  ...mockIssuable,
+  ...mockIssuableShowProps,
+};
+
+const createComponent = (propsData = issuableHeaderProps) =>
+  shallowMount(IssuableHeader, {
+    propsData,
+    slots: {
+      'status-badge': 'Open',
+      'header-actions': `
+        <button class="js-close">Close issuable</button>
+        <a class="js-new" href="/gitlab-org/gitlab-shell/-/issues/new">New issuable</a>
+      `,
+    },
+  });
+
+describe('IssuableHeader', () => {
+  let wrapper;
+  const findByTestId = testId => wrapper.find(`[data-testid="${testId}"]`);
+
+  beforeEach(() => {
+    wrapper = createComponent();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('computed', () => {
+    describe('authorId', () => {
+      it('returns numeric ID from GraphQL ID of `author` prop', () => {
+        expect(wrapper.vm.authorId).toBe(1);
+      });
+    });
+  });
+
+  describe('handleRightSidebarToggleClick', () => {
+    beforeEach(() => {
+      setFixtures('<button class="js-toggle-right-sidebar-button">Collapse sidebar</button>');
+    });
+
+    it('dispatches `click` event on sidebar toggle button', () => {
+      wrapper.vm.toggleSidebarButtonEl = document.querySelector('.js-toggle-right-sidebar-button');
+      jest.spyOn(wrapper.vm.toggleSidebarButtonEl, 'dispatchEvent').mockImplementation(jest.fn);
+
+      wrapper.vm.handleRightSidebarToggleClick();
+
+      expect(wrapper.vm.toggleSidebarButtonEl.dispatchEvent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          type: 'click',
+        }),
+      );
+    });
+  });
+
+  describe('template', () => {
+    it('renders issuable status icon and text', () => {
+      const statusBoxEl = findByTestId('status');
+
+      expect(statusBoxEl.exists()).toBe(true);
+      expect(statusBoxEl.find(GlIcon).props('name')).toBe(mockIssuableShowProps.statusIcon);
+      expect(statusBoxEl.text()).toContain('Open');
+    });
+
+    it('renders blocked icon when issuable is blocked', async () => {
+      wrapper.setProps({
+        blocked: true,
+      });
+
+      await wrapper.vm.$nextTick();
+
+      const blockedEl = findByTestId('blocked');
+
+      expect(blockedEl.exists()).toBe(true);
+      expect(blockedEl.find(GlIcon).props('name')).toBe('lock');
+    });
+
+    it('renders confidential icon when issuable is confidential', async () => {
+      wrapper.setProps({
+        confidential: true,
+      });
+
+      await wrapper.vm.$nextTick();
+
+      const confidentialEl = findByTestId('confidential');
+
+      expect(confidentialEl.exists()).toBe(true);
+      expect(confidentialEl.find(GlIcon).props('name')).toBe('eye-slash');
+    });
+
+    it('renders issuable author avatar', () => {
+      const { username, name, webUrl, avatarUrl } = mockIssuable.author;
+      const avatarElAttrs = {
+        'data-user-id': '1',
+        'data-username': username,
+        'data-name': name,
+        href: webUrl,
+        target: '_blank',
+      };
+      const avatarEl = findByTestId('avatar');
+      expect(avatarEl.exists()).toBe(true);
+      expect(avatarEl.attributes()).toMatchObject(avatarElAttrs);
+      expect(avatarEl.find(GlAvatarLabeled).attributes()).toMatchObject({
+        size: '24',
+        src: avatarUrl,
+        label: name,
+      });
+    });
+
+    it('renders sidebar toggle button', () => {
+      const toggleButtonEl = findByTestId('sidebar-toggle');
+
+      expect(toggleButtonEl.exists()).toBe(true);
+      expect(toggleButtonEl.props('icon')).toBe('chevron-double-lg-left');
+    });
+
+    it('renders header actions', () => {
+      const actionsEl = findByTestId('header-actions');
+
+      expect(actionsEl.find('button.js-close').exists()).toBe(true);
+      expect(actionsEl.find('a.js-new').exists()).toBe(true);
+    });
+  });
+});