The config file

Key points

The playwright.config.ts file decides how the tests run. You can read most of its lines without knowing code:

• testDir: where to look for tests.
• fullyParallel and workers: how many tests run in parallel.
• retries: how many times to retry a failed test.
• reporter: which report to create. 'html' is the report we see in chapter 5.
• use.trace: when to save a trace. We use it in chapter 6.
• projects: which browsers to run in.

Without editing the file

You can change behaviour from the command line with flags: --headed (show the browser), --project=chromium (one browser), --workers=1 (one test at a time).