intermediatePhase ·

Controller Testing

Test REST controllers with MockMvc or WebTestClient.

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Controller Testing

MockMvc Test

@WebMvcTest(ProductController.class)
class ProductControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private ProductService productService;

    @Test
    void shouldReturnProduct() throws Exception {
        when(productService.getById(1L))
            .thenReturn(new Product(1L, "Laptop"));

        mockMvc.perform(get("/api/products/1"))
            .andExpect(status().isOk())
            .andExpect(jsonPath("$.name").value("Laptop"));
    }
}

Testing Strategies

Testing Pyramid

     /  E2E  \
    /----------\
   / Integration \
  /----------------\
 /      Unit        \
/--------------------

Test Types

Unit: Individual components
Integration: Component interactions
E2E: Full user workflows
Performance: Load/stress testing

Best Practices

Write tests first (TDD)
Aim for 80% coverage
Test edge cases
Keep tests fast and isolated

Key Points

Understanding Controller Testing is essential for production systems
Always consider scalability and maintainability
Test thoroughly before deploying to production
Monitor performance and set up alerting

Common Patterns

Validation: Always validate input at the boundary
Error Handling: Use structured error responses
Logging: Log key events for debugging
Testing: Unit, integration, and load tests
Documentation: Keep docs updated with code changes

Practice Problems

0/3solved

intermediateImplement Controller Testing

Design and implement a solution for Controller Testing in a backend system. Consider scalability, error handling, and production readiness.

Solution

// Controller Testing implementation
// Key aspects: validation, error handling, logging, testing

public class ControllerTesting {
    // Production-ready implementation
}

intermediateController Testing Edge Cases

Identify and handle edge cases for Controller Testing. What happens under high load, with invalid input, or during failures?

Solution

// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotency

beginnerController Testing Testing Strategy

Write a testing strategy for Controller Testing. Include unit tests, integration tests, and performance tests.

Solution

// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injection

Flashcards

Question

@WebMvcTest loads?

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Answer

Only web layer (controllers)

Question

@WebMvcTest excludes?

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Answer

Services, repositories

Question

What is Controller Testing?

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Answer

Controller Testing is a key concept in backend development.

Question

When to use Controller Testing?

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Answer

Use Controller Testing when building production systems that require reliability, scalability, and maintainability.

Question

Controller Testing best practices

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Answer

Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.

Controller Testing

Controller Testing

MockMvc Test

Testing Strategies

Testing Pyramid

Test Types

Best Practices

Key Points

Common Patterns

Practice Problems

Quiz

Flashcards

Revision Notes

Key Takeaways

Interview Tips

Cheat Sheet

Controller Testing