Add tests for Header, Layout, MainContent, and Sidebar components

app/src/components/layout/Header.test.tsx

@@ -0,0 +1,62 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render } from '../../test/utils';
+import Header from './Header';
+
+// Mock the child components
+vi.mock('../navigation/UserMenu', () => ({
+  default: () => <div data-testid="user-menu">User Menu</div>,
+}));
+
+vi.mock('../navigation/WorkspaceSwitcher', () => ({
+  default: () => <div data-testid="workspace-switcher">Workspace Switcher</div>,
+}));
+
+vi.mock('../settings/workspace/WorkspaceSettings', () => ({
+  default: () => <div data-testid="workspace-settings">Workspace Settings</div>,
+}));
+
+const TestWrapper = ({ children }: { children: React.ReactNode }) => (
+  <div>{children}</div>
+);
+
+describe('Header', () => {
+  it('renders the app title', () => {
+    const { getByText } = render(
+      <TestWrapper>
+        <Header />
+      </TestWrapper>
+    );
+
+    expect(getByText('Lemma')).toBeInTheDocument();
+  });
+
+  it('renders user menu component', () => {
+    const { getByTestId } = render(
+      <TestWrapper>
+        <Header />
+      </TestWrapper>
+    );
+
+    expect(getByTestId('user-menu')).toBeInTheDocument();
+  });
+
+  it('renders workspace switcher component', () => {
+    const { getByTestId } = render(
+      <TestWrapper>
+        <Header />
+      </TestWrapper>
+    );
+
+    expect(getByTestId('workspace-switcher')).toBeInTheDocument();
+  });
+
+  it('renders workspace settings component', () => {
+    const { getByTestId } = render(
+      <TestWrapper>
+        <Header />
+      </TestWrapper>
+    );
+
+    expect(getByTestId('workspace-settings')).toBeInTheDocument();
+  });
+});