Spring Boot Testing Spring Applications 3

Question 1

Which tool is the default test framework bundled with Spring Boot starter test?

Accepted Answer

JUnit 5 (Jupiter)

Answer

spring-boot-starter-test includes JUnit 5 (Jupiter) as the default testing framework since Spring Boot 2.2.

Question 2

What does @ExtendWith(SpringExtension.class) do in a JUnit 5 Spring test?

Accepted Answer

Integrates the Spring TestContext Framework with JUnit 5

Answer

@ExtendWith(SpringExtension.class) hooks the Spring TestContext Framework lifecycle into JUnit 5, enabling Spring context loading and dependency injection in tests.

Question 3

Which HTTP client is recommended for integration tests when using a real embedded server with WebFlux?

Accepted Answer

WebTestClient

Answer

WebTestClient provides a reactive, fluent API suitable for testing both WebFlux and Servlet-based endpoints against a running server.

Question 4

What annotation should you use to test only the Spring Security configuration layer without a full context?

Accepted Answer

@WebMvcTest with @WithMockUser

Answer

@WebMvcTest loads only the MVC layer and @WithMockUser provides a mock authenticated user for security testing.

Question 5

What is the effect of annotating a test class with @Transactional in Spring tests?

Accepted Answer

Rolls back the transaction after each test method by default

Answer

In Spring test classes, @Transactional causes each test method to run in a transaction that is automatically rolled back after the method completes.

Spring Boot Practice Test

Spring Boot Practice Test

Spring Boot Testing Spring Applications 3