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Gleam ships a zero‑dependency test runner that discovers and runs tests in `test/` folders. Learn how to write, run, and tweak tests, and when the built‑in tools hit their limits.
Thealgorithms provides categorized algorithm implementations in Python/Java. Use the included unit tests (e.g., pytest) to verify correctness, especially against edge cases like empty lists, before deployment.
Use Jest modern fake timers to test debounce and polling logic without real delays, plus gotchas with promises and recursive timers.
A diagnostic guide for Jasmine createSpy when spies don't record calls or return values. Covers createSpy vs spyOn, injection pitfalls, behavior configuration with and.returnValue, and verification with toHaveBeenCalledTimes.
Learn how to use Jasmine Spies to isolate units of code, replace real dependencies with mocks, and verify function calls without triggering side effects.
Replace dependencies in Jest tests using manual mocks stored in __mocks__ folders, with a worked example and limits.
Learn how to use Bun's built-in test runner to execute TypeScript unit tests without separate transpilation steps, reducing overhead and increasing developer velocity.
Jasmine's jasmine.addMatchers lets you express domain rules directly in specs. Learn how to define, scope, and verify a toBeWithinRange matcher—and where custom matchers add maintenance risk.
Keep private utilities private and still test them with Vitest in-source testing, then verify Vite strips the tests from production builds.
gleam
python
java
jest
jasmine
javascript
nodejs
bun
typescript
vitest