Testing in Spring

Question 1

What is the role of @SpringBootTest in Spring Boot?

Answer 1

It is used to create an application context for integration testing.

Question 2

How do you mock a Spring bean in a unit test?

Answer 2

By using @MockBean in conjunction with testing frameworks like Mockito.

Question 3

What is the difference between @Mock and @MockBean?

Answer 3

@Mock is used with Mockito in unit tests, while @MockBean is used to mock a Spring bean in the application context.

Question 4

How do you test a Spring MVC controller?

Answer 4

Using MockMvc to simulate HTTP requests and assert responses.

Question 5

What is @DataJpaTest in Spring Boot?

Answer 5

It is used for testing JPA repositories with an embedded database and limited Spring context.

Question 6

What is @WebMvcTest used for in Spring Boot testing?

Answer 6

It is used for testing Spring MVC controllers by loading only the web layer of the application.

Question 7

How does @TestConfiguration help in testing Spring applications?

Answer 7

It allows you to define additional beans or override existing ones specifically for test scenarios.

Question 8

What is Spring TestContext Framework?

Answer 8

A testing framework in Spring that integrates with JUnit or TestNG to support Spring-based tests.

Question 9

What is @Transactional used for in testing?

Answer 9

It rolls back transactions after each test method, ensuring a clean database state between tests.

Question 10

How can you test a Spring Boot REST API?

Answer 10

By using @RestClientTest or MockMvc to mock HTTP requests and validate responses.