Adaptive skill practice — find your level, get sharper.
Testing practice
Write tests that catch bugs and survive refactors
Master the testing discipline — unit vs integration vs end-to-end and the test pyramid, test doubles (mock/stub/fake/spy), TDD and the AAA / given-when-then structure, code coverage and its limits, flaky tests and how to fix them, and advanced techniques (property-based, mutation, contract testing). Cross-language and evergreen. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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