Testing Strategies for Microservices

# Testing Strategies for Microservices

Testing microservices requires a different approach than monoliths. Here's a complete strategy.

## The Testing Pyramid

**Unit Tests (70%)**

Fast, isolated tests for business logic. Mock external dependencies.

**Integration Tests (20%)**

Test service boundaries and external integrations. Use test containers.

**E2E Tests (10%)**

Full system tests. Keep these minimal—they're slow and brittle.

## Service Testing

**Contract Testing**

Ensure services honor their API contracts. Pact or Spring Cloud Contract.

**Chaos Engineering**

Intentionally break things to verify resilience. Start with Netflix's Chaos Monkey.

## CI/CD Integration

- Run unit tests on every commit

- Integration tests before merge

- E2E tests before production

- Canary deployments for final validation

Confidence comes from comprehensive, fast tests.