testing-strategies

---
name: testing-strategies
description: Testing strategies including contract testing, snapshot testing, mutation testing, property-based testing, and test organization
---

# Testing Strategies

## Test Structure (Arrange-Act-Assert)

```typescript
describe("OrderService", () => {
  describe("createOrder", () => {
    it("creates an order with valid items and returns order ID", async () => {
      const repo = new InMemoryOrderRepository();
      const service = new OrderService(repo);