Spring Boot Testing Spring Applications 2

Question 1

Which annotation replaces the full application context with only web-layer beans during testing?

Accepted Answer

@WebMvcTest

Answer

@WebMvcTest loads only the MVC layer (controllers, filters, converters) without starting a full application context.

Question 2

What does the @DataJpaTest annotation do by default regarding the database?

Accepted Answer

Uses an in-memory embedded database and rolls back each test

Answer

@DataJpaTest auto-configures an embedded in-memory database and wraps each test in a transaction that rolls back after the test.

Question 3

How can you inject a mock bean into the Spring application context using Mockito?

Accepted Answer

@MockBean

Answer

@MockBean creates a Mockito mock and registers it as a Spring bean, replacing any existing bean of that type in the context.

Question 4

Which class is used to perform HTTP requests in MockMvc-based tests?

Accepted Answer

MockMvcRequestBuilders

Answer

MockMvcRequestBuilders provides static factory methods like get(), post(), put(), and delete() for constructing MockMvc requests.

Question 5

In a @SpringBootTest test, what webEnvironment setting starts an actual HTTP server on a random port?

Accepted Answer

RANDOM_PORT

Answer

RANDOM_PORT starts an embedded server on a random available port, and you can inject the port with @LocalServerPort.

Spring Boot Practice Test