@DataJpaTest for repository testing in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to annotate the test class for JPA repository testing.

Spring Boot

@[1] 
public class UserRepositoryTest {
    // test methods
}

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ADataJpaTest

BSpringBootTest

CRestController

DComponent

Attempts:

3 left

💡 Hint

Common Mistakes

Using @SpringBootTest instead of @DataJpaTest

Forgetting the @DataJpaTest annotation

The @DataJpaTest annotation is used to configure a test class for JPA repository testing in Spring Boot.

2fill in blank

medium

Complete the code to inject the repository into the test class.

Spring Boot

@Autowired
private [1] userRepository;

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AUserService

BUserRepository

CUserController

DUserEntity

Attempts:

3 left

💡 Hint

Common Mistakes

Injecting a service or controller instead of the repository

Using the entity class instead of the repository

The repository interface, typically named UserRepository, is injected to test its methods.

3fill in blank

hard

Fix the error in the test method to save and verify a user entity.

Spring Boot

@Test
void testSaveUser() {
    User user = new User();
    user.setName("Alice");
    userRepository.[1](user);
    assertNotNull(user.getId());
}

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Asave

Bdelete

CfindAll

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete or findAll instead of save

Trying to call update which does not exist in JpaRepository

The save method persists the entity and assigns an ID.

4fill in blank

hard

Fill both blanks to write a query method test that finds a user by name.

Spring Boot

@Test
void testFindByName() {
    User user = new User();
    user.setName("Bob");
    userRepository.save(user);
    Optional<User> found = userRepository.[1]("Bob");
    assertTrue(found.[2]());
}

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AfindByName

BisPresent

Cget

DexistsByName

Attempts:

3 left

💡 Hint

Common Mistakes

Using get() without checking presence

Using existsByName which returns boolean, not Optional

The repository method findByName returns an Optional. Use isPresent() to check if a user was found.

5fill in blank

hard

Fill all three blanks to create a test that deletes a user and verifies it no longer exists.

Spring Boot

@Test
void testDeleteUser() {
    User user = new User();
    user.setName("Carol");
    userRepository.save(user);
    userRepository.[1](user);
    Boolean exists = userRepository.[2](user.getId());
    assertFalse(exists.[3]());
}

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Adelete

BexistsById

CbooleanValue

DdeleteById

Attempts:

3 left

💡 Hint

Common Mistakes

Using deleteById instead of delete when passing the entity

Not converting Boolean to primitive before assertFalse

Use delete to remove the entity, existsById to check if it still exists, and booleanValue() to get the primitive boolean for assertion.