harden

webclient/src/components/VirtualList/VirtualList.spec.tsx

@@ -0,0 +1,21 @@
+import { render } from '@testing-library/react';
+import VirtualList from './VirtualList';
+
+describe('VirtualList', () => {
+  it('renders without crashing with empty items', () => {
+    const { container } = render(<VirtualList items={[]} />);
+    expect(container.querySelector('.virtual-list')).toBeInTheDocument();
+  });
+
+  it('accepts className as a string', () => {
+    const { container } = render(<VirtualList items={[]} className="custom-class" />);
+    expect(container.querySelector('.custom-class')).toBeInTheDocument();
+  });
+
+  it('applies empty string as default className (not object)', () => {
+    const { container } = render(<VirtualList items={[]} />);
+    const list = container.querySelector('.virtual-list__list');
+    // className should not contain "[object Object]"
+    expect(list?.className).not.toContain('[object Object]');
+  });
+});