JavaScript Testing Standards

Unit testing standards for JavaScript projects using Jest, covering test structure, DOM interaction, web component testing, mocking, async patterns, and coverage.

Enforcement

• Prohibited actions: Do not generate tests that depend on implementation internals; do not use arbitrary setTimeout waits in tests
• Constraints: Tests must follow AAA (Arrange-Act-Assert) pattern; each test verifies one behavior

Prerequisites

• Jest 29+
• jsdom test environment (for DOM/component testing)
• @testing-library/jest-dom (recommended for DOM assertions)

Workflow

Step 1: Load Test Fundamentals