Configuring Playwright for CI

import { defineConfig, devices } from '@playwright/test';

export default defineConfig({
  testDir: './tests',

  // CI: retry failed tests to handle flakiness
  // Local: no retries, fix the test immediately
  retries: process.env.CI ? 2 : 0,

  // CI: use half the available CPUs
  // Local: let Playwright decide
  workers: process.env.CI ? '50%' : undefined,

  // CI: forbid test.only -- fail the build if someone left it in
  forbidOnly: !!process.env.CI,

  // Reporter configuration
  reporter: process.env.CI
    ? [
        ['html', { open: 'never' }],
        ['github'],         // Annotates PR with failures
        ['list'],           // Logs to CI console
      ]
    : [['html', { open: 'on-failure' }]],

  use: {
    // Always headless in CI (default), headed locally for debugging
    headless: process.env.CI ? true : false,

    // Capture trace on first retry (CI) or retain on failure (local)
    trace: process.env.CI ? 'on-first-retry' : 'retain-on-failure',

    // Screenshot only on failure to save storage
    screenshot: 'only-on-failure',

    // Shorter timeout in CI -- fail fast
    actionTimeout: process.env.CI ? 10_000 : 30_000,

    // Video only in CI on first retry
    video: process.env.CI ? 'on-first-retry' : 'off',
  },

  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
    {
      name: 'firefox',
      use: { ...devices['Desktop Firefox'] },
    },
    {
      name: 'webkit',
      use: { ...devices['Desktop Safari'] },
    },
  ],
});

// Someone left this in and pushed it
test.only('should login with valid credentials', async ({ page }) => {
  // This is the ONLY test that runs in CI
  // 200 other tests are silently skipped
});