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Tests are code that checks your code, so you can change things without fear. This track starts with your first expect in Vitest and ends with a team's whole safety net: clear unit tests, edge cases and boundaries, test doubles for time and randomness, an integration test for a Go web handler, end-to-end tests that drive a real browser with Playwright, flaky tests and how to kill them, and the red, green, refactor loop of TDD.

Examples use TypeScript with Vitest, one Go test and Playwright, all on the features of a small social app called Nova: points, tiers, leaderboards, sign-ups and posts. Basic JavaScript or TypeScript is all you need to start.