test: improve coverage

Author: rpenido

src/studio-home/StudioHome.test.tsx

@@ -112,6 +112,18 @@ describe('<StudioHome />', () => {
       expect(spinner.textContent).toEqual('Loading...');
     });
 
+    it('should render "email staff" header button if enabled', async () => {
+      mockUseSelector.mockReturnValue({
+        ...studioHomeMock,
+        isShowEmailStaff: true,
+      });
+
+      render(<StudioHome />, { path: '/home' });
+      const header = getHeaderElement();
+      const link = within(header).getByRole('link', { name: 'Email staff to create course' });
+      expect(link).toHaveAttribute('href', `mailto:${studioRequestEmail}`);
+    });
+
     describe('render new library button', () => {
       it('should navigate to legacy library creation when libraries-v2 disabled', async () => {
         mockUseSelector.mockReturnValue({