Ava - Futuristic JavaScript test runner

AVA is a test runner for Node.js with a concise API, detailed error output, embrace of new language features and process isolation that lets you develop with confidence. AVA automatically detects whether your CI environment supports parallel builds. Each build will run a subset of all test files, while still making sure all tests get executed. It automatically removes unrelated lines in stack traces, allowing you to find the source of an error much faster.

Its features include:

• Minimal and fast
• Simple test syntax
• Runs tests concurrently
• Enforces writing atomic tests
• No implicit globals
• Includes TypeScript definitions
• Magic assert
• Isolated environment for each test file
• Promise support
• Async function support
• Observable support
• Enhanced assertion messages
• Automatic parallel test runs in CI
• TAP reporter