charhub-jest-patterns

What problem does it solve?

Writing consistent, reliable Jest tests for CharHub's Express/NestJS backend can be error-prone without established patterns. This Skill provides standardized testing patterns, mocking strategies, and a cohesive structure to reduce boilerplate and improve test quality.

Core Features & Use Cases

• Mocking Prisma with jest-mock-extended for deterministic tests.
• NestJS TestingModule patterns for unit and integration tests.
• Async testing patterns, error handling, and test isolation.
• Custom and common matchers to improve assertions.
• Test doubles (spies and stubs) to verify interactions.
• End-to-end guidance for structuring tests across controllers, services, and utilities.

Quick Start

Create a unit test for a NestJS service using mockDeep and Prisma mocks following the patterns in this guide.