✅ Add test for AppAvatar

src/components/AppAvatar.test.tsx

@@ -0,0 +1,16 @@
+import { render } from '@testing-library/react';
+import { describe, expect, it } from 'vitest';
+import { AppAvatar } from './AppAvatar';
+
+describe(AppAvatar.name, () => {
+  it.concurrent('display placeholder when no url', () => {
+    const { container } = render(<AppAvatar iconUrl="" color="blue" />);
+
+    expect(container.firstElementChild).not.toBeNull();
+    expect(container.firstElementChild!.className).contain('mantine-Avatar-root');
+
+    const svgElement = container.querySelector('svg');
+    expect(svgElement).not.toBeNull();
+    expect(svgElement?.getAttribute('fill')).not.toBeNull();
+  });
+});