test(copyrepobutton): add error resilience coverage

Author: mayank200529

app/components/CopyRepoButton.error-resilience.test.tsx

@@ -0,0 +1,88 @@
+import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { describe, expect, it, vi, beforeEach } from 'vitest';
+
+import CopyRepoButton from './CopyRepoButton';
+
+vi.mock('lucide-react', () => ({
+  Copy: () => <svg data-testid="copy-icon" />,
+}));
+
+describe('CopyRepoButton error resilience', () => {
+  beforeEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('renders successfully during initial mount', () => {
+    render(<CopyRepoButton />);
+
+    expect(screen.getByRole('button', { name: /copy url/i })).toBeDefined();
+  });
+
+  it('does not crash when clipboard write rejects', async () => {
+    Object.assign(navigator, {
+      clipboard: {
+        writeText: vi.fn().mockRejectedValue(new Error('Clipboard failed')),
+      },
+    });
+
+    render(<CopyRepoButton />);
+
+    fireEvent.click(screen.getByRole('button'));
+
+    await waitFor(() => {
+      expect(screen.getByRole('button')).toBeDefined();
+    });
+  });
+
+  it('keeps original label visible after clipboard failure', async () => {
+    Object.assign(navigator, {
+      clipboard: {
+        writeText: vi.fn().mockRejectedValue(new Error('Clipboard failed')),
+      },
+    });
+
+    render(<CopyRepoButton />);
+
+    fireEvent.click(screen.getByRole('button'));
+
+    await waitFor(() => {
+      expect(screen.getByText(/copy url/i)).toBeDefined();
+    });
+  });
+
+  it('renders icon even when copy action fails', async () => {
+    Object.assign(navigator, {
+      clipboard: {
+        writeText: vi.fn().mockRejectedValue(new Error('Clipboard failed')),
+      },
+    });
+
+    render(<CopyRepoButton />);
+
+    fireEvent.click(screen.getByRole('button'));
+
+    await waitFor(() => {
+      expect(screen.getByTestId('copy-icon')).toBeDefined();
+    });
+  });
+
+  it('allows repeated failed copy attempts without crashing', async () => {
+    Object.assign(navigator, {
+      clipboard: {
+        writeText: vi.fn().mockRejectedValue(new Error('Clipboard failed')),
+      },
+    });
+
+    render(<CopyRepoButton />);
+
+    const button = screen.getByRole('button');
+
+    fireEvent.click(button);
+    fireEvent.click(button);
+    fireEvent.click(button);
+
+    await waitFor(() => {
+      expect(screen.getByRole('button')).toBeDefined();
+    });
+  });
+});