Testing Guide

packages/
├── business-logic/
│   └── src/
│       ├── streak-calculator.ts
│       └── streak-calculator.test.ts  ← Co-located
├── database/
│   └── src/
│       └── encryption.test.ts
└── utils/
    └── src/
        └── date-utils.test.ts

apps/
├── api/
│   └── tests/
│       ├── auth.test.ts
│       └── cache.test.ts
└── web/
    └── e2e/
        ├── auth.spec.ts
        └── dashboard.spec.ts

pnpm test

pnpm --filter @running-days/business-logic test
pnpm --filter @running-days/database test

pnpm --filter @running-days/business-logic test:watch

pnpm test:coverage

import { describe, it, expect } from 'vitest';
import { calculateStreaks } from './streak-calculator.js';

describe('calculateStreaks', () => {
  it('should return 0 for empty input', () => {
    const result = calculateStreaks([]);
    expect(result.current).toBe(0);
  });
});

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';

describe('time-sensitive tests', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.setSystemTime(new Date('2024-01-15T12:00:00Z'));
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  it('should calculate based on current date', () => {
    // Test runs as if it's Jan 15, 2024
  });
});

it('should fetch data', async () => {
  const result = await fetchWorkouts();
  expect(result).toHaveLength(5);
});

# All E2E tests
pnpm --filter @running-days/web test:e2e

# Specific test file
pnpm --filter @running-days/web test:e2e auth.spec.ts

# With UI mode
pnpm --filter @running-days/web test:e2e --ui

import { test, expect } from '@playwright/test';

test('user can view dashboard', async ({ page }) => {
  await page.goto('/dashboard');
  await expect(page.getByRole('heading', { name: 'Dashboard' })).toBeVisible();
});

test('authenticated dashboard shows workouts', async ({ page }) => {
  // Mock auth is handled by test fixtures
  await page.goto('/dashboard');
  await expect(page.getByTestId('workout-list')).toBeVisible();
});