Spring boot - Testing

Question 1

@SpringBootTest

Answer 1

-Starts the full application context. It injects all beans (repositories, services, controllers etc)
- Sets up a transactional rollback, Auto configures a H2 test database
- Provides utilities like:
- @MockitoBean - for replacing real beans
- @DataJpaTest - for fast JPA-only integration tests
- @WebMvcTest - for controller-level tests

Question 2

@Test

Answer 2

Marks a method as a test case, the JUnit runtime will scan the classes, find methods with the @Test annotation and execute them as part of the test suite

Question 3

@DisplayName

Answer 3

Provides a readable name for the test

Question 4

@DataJpaTest

Answer 4

Only loads the Jpa related parts of the spring context, by default it uses H2, in memory database

@DataJpaTest
class RepoTest{}

Question 5

What is the purpose of @WebMvcTest?

Answer 5

It tests only the web layer (controllers and MVC components) without loading the full context, typically using MockMvc to simulate HTTP requests

Question 6

@Mock

Answer 6

used to create a mock instance of a class or
interface

Question 7

@InjectMocks

Answer 7

annotation is used to create an instance of
the class you want to test and automatically inject the
fields marked with @Mock

Question 8

@ExtendWith(MockitoExtension.class)

Answer 8

Mockito annotations need to be enabled in Junit 5 using
this class annotation