Initial commit

frontend/tests/unit/TimeAdjuster.test.tsx

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+import { describe, it, expect, vi } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import TimeAdjuster from '../../src/components/tracker/TimeAdjuster';
+
+describe('TimeAdjuster', () => {
+  it('renders with default value', () => {
+    const { container } = render(<TimeAdjuster onTimeChange={() => {}} />);
+    const input = container.querySelector('input'); 
+    expect(input).toBeInTheDocument();
+  });
+
+  it('calls onTimeChange when value changes', () => {
+    const handleChange = vi.fn();
+    const { container } = render(<TimeAdjuster onTimeChange={handleChange} />);
+    const input = container.querySelector('input');
+    
+    fireEvent.change(input!, { target: { value: '2024-01-01T12:00' } });
+    expect(handleChange).toHaveBeenCalledWith('2024-01-01T12:00');
+  });
+
+  it('resets to now when reset button is clicked', async () => {
+    const handleChange = vi.fn();
+    render(<TimeAdjuster onTimeChange={handleChange} />);
+    const resetButton = screen.getByText(/Reset to now/i);
+    
+    fireEvent.click(resetButton);
+    expect(handleChange).toHaveBeenCalled();
+  });
+});