testing-typescript

Test TypeScript code with strict type-safe patterns across unit, integration, and E2E layers.

1|Updated Jan 6, 2026

Search Tags:#typescript #vitest #testing #integration #type-safety #dependency-injection #harness

Ready to run

npx skills add https://github.com/simonheimlicher/spx-claude --skill testing-typescript

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: testing-typescript
Source: https://github.com/simonheimlicher/spx-claude/tree/main/plugins/typescript/skills/testing-typescript
Command: npx skills add https://github.com/simonheimlicher/spx-claude --skill testing-typescript

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Tests TypeScript code with strict type-safe patterns.

Core Features & Use Cases

Type-safe unit tests using Vitest and DI patterns.
Harness-driven integration tests with real dependencies while keeping test boundaries.
Structured test organization across Level 1-3 test types for TypeScript projects.

Quick Start

Use the testing-typescript skill as a template for progressive TypeScript testing. Install Vitest in your project and follow the provided patterns to validate code across unit, integration, and E2E layers. Create co-located tests and fixtures to ensure repeatable, type-safe validation.

Frequently Asked Questions about testing-typescript

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I write type-safe TypeScript tests with dependency injection?▼

Type-safe TypeScript tests enforce dependency injection and typed data factories to validate code paths. Using Vitest, you inject dependencies and create typed fixtures to ensure repeatable, type-safe validation across unit and integration layers.

What's the best way to structure TypeScript integration tests with real dependencies?▼

Harness-driven integration tests manage real dependencies while keeping test boundaries. You use test harnesses to control dependency injection and typed data factories, ensuring type-safe validation of integration scenarios without losing boundary isolation.

How do I organize unit, integration, and E2E tests in a TypeScript project?▼

Structured test organization co-locates tests across Level 1-3 test types. You place unit, integration, and E2E tests alongside source code using progressive type-safe patterns, ensuring repeatable validation at each layer of the TypeScript project.

Does Vitest support type-safe data factories for TypeScript testing?▼

Vitest supports type-safe data factories through dependency injection and typed fixture patterns. You create co-located test fixtures that enforce type safety, providing repeatable, typed test data for validating code paths across different test levels.

Why should I use dependency injection in TypeScript unit tests?▼

Dependency injection in TypeScript unit tests enforces strict type-safe patterns and test boundary isolation. Injecting dependencies rather than importing them directly ensures repeatable validation and allows harnesses to control real dependencies during testing.

Can I use type-safe testing patterns for E2E scenarios in TypeScript?▼

Type-safe testing patterns extend to E2E scenarios through Level 1-3 test coverage. You apply dependency injection, harnesses, and typed data factories to validate end-to-end code paths, ensuring type safety across all progressive test layers.