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TypeScript testing strategies and type-safe test practices

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SKILL.md

name testing
description TypeScript testing strategies and type-safe test practices
sasmp_version 1.3.0
bonded_agent 08-typescript-tooling-quality
bond_type PRIMARY_BOND

TypeScript Testing Skill

Overview

Master TypeScript testing including type-safe test setup, mocking with types, and testing type definitions.

Topics Covered

Test Setup

  • Jest with ts-jest
  • Vitest configuration
  • ts-node for tests
  • Path alias resolution
  • Test coverage with types

Type-Safe Mocking

  • Typed mock functions
  • jest.Mocked utility
  • vi.fn() typing
  • Mock implementations
  • Partial mocking

Type Testing

  • tsd for type tests
  • expect-type library
  • Type assertion tests
  • Compile-time testing
  • Edge case type testing

Testing Patterns

  • Generic test utilities
  • Type-safe fixtures
  • Builder patterns for tests
  • Custom matchers with types
  • Assertion type narrowing

Integration Testing

  • API testing with types
  • Database testing
  • E2E type safety
  • Request/response typing
  • Test data factories

Prerequisites

  • TypeScript fundamentals
  • JavaScript testing basics

Learning Outcomes

  • Write type-safe tests
  • Test type definitions
  • Create typed mocks
  • Build test utilities