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testing-strategies

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

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# 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);
      const input = { customerId: "c1", items: [{ productId: "p1", quantity: 2 }] };

      const result = await service.createOrder(input);