JavaScript Testing Best Practices Overview Comprehensive guidance for writing high-quality JavaScript/Node.js tests using Vitest with 100% code coverage. Testing Framework: Vitest Why Vitest: - Native ESM support (no experimental flags) - Seamless JSDOM integration - Faster than Jest - Jest-compatible API - Built-in coverage with v8 Test structure: Vitest Globals Globals available automatically - no imports needed: Available globals: , , , , , , , , Only import vi when mocking: Coverage Requirements 100% Required For - All scripts in - All scripts in - All utilities in - Business logic script…