typescript-testing

What problem does it solve?

TypeScript projects often require robust, well-structured tests; this guide provides practical patterns and conventions for Vitest and Jest to improve reliability and maintainability of TS tests.

Core Features & Use Cases

• Guidance on test structure and conventions: Arrange-Act-Assert, descriptive names, isolation, and clear teardown.
• Mocking strategies: How to mock dependencies, avoid over-mocking, and verify interactions.
• Async testing patterns: Handling promises, timers, and mocks in TS tests.
• Quality & coverage targets: Guidance toward achieving high coverage with meaningful metrics.
• Real-world example: Example of testing a service with a repository mock in TypeScript.

Quick Start

Write a simple Vitest-based unit test suite for a sample TypeScript service and run tests to verify structure and assertions.