test(dashboard): add vitest suite for commit clock component

Author: TanmayNelge

components/dashboard/CommitClock.test.tsx

@@ -0,0 +1,55 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect, vi } from 'vitest';
+import type { ReactNode } from 'react';
+import CommitClock from './CommitClock';
+import type { CommitClockData } from '@/types/dashboard';
+
+// 1. Mock framer-motion to prevent animation errors during DOM testing
+vi.mock('framer-motion', () => ({
+  motion: {
+    div: ({ children, className }: { children: ReactNode; className?: string }) => (
+      <div className={className}>{children}</div>
+    ),
+    g: ({ children }: { children: ReactNode }) => <g>{children}</g>,
+  },
+}));
+
+describe('CommitClock', () => {
+  // Helper to generate properly typed mock data
+  const generateMockData = (commits: number): CommitClockData[] => [
+    { day: 'Sun', commits },
+    { day: 'Mon', commits },
+    { day: 'Tue', commits },
+    { day: 'Wed', commits },
+    { day: 'Thu', commits },
+    { day: 'Fri', commits },
+    { day: 'Sat', commits },
+  ];
+
+  it("renders 'Commit Clock' heading", () => {
+    render(<CommitClock data={generateMockData(5)} />);
+    expect(screen.getByRole('heading', { name: /commit clock/i })).toBeDefined();
+  });
+
+  it("renders 'Weekly activity cycle' subtitle", () => {
+    render(<CommitClock data={generateMockData(5)} />);
+    expect(screen.getByText(/weekly activity cycle/i)).toBeDefined();
+  });
+
+  it('renders all 7 day labels', () => {
+    render(<CommitClock data={generateMockData(5)} />);
+    const days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
+    days.forEach((day) => {
+      expect(screen.getByText(day)).toBeDefined();
+    });
+  });
+
+  it('renders an SVG element', () => {
+    const { container } = render(<CommitClock data={generateMockData(5)} />);
+    expect(container.querySelector('svg')).not.toBeNull();
+  });
+
+  it('renders with all-zero commit data without crashing', () => {
+    expect(() => render(<CommitClock data={generateMockData(0)} />)).not.toThrow();
+  });
+});