JPA Repository null in junit tests

Question

I am trying to write a very basic test for my repository/service classes, but for reasons I cannot seem to figure out, my autowired repository is always null.

Here is the Repo class

public interface RuleRepository extends JpaRepository<Rule, UUID> {   
    public Optional<Rule> findByName(String name);
}

And the test

@DataJpaTest
@ContextConfiguration(classes = MyApplication.class)
public class RulesTest {
    @Autowired
    private RuleRepository ruleRepository;  

    @Test
    public void testSaveOneRule() {
        if (ruleRepository == null) {
            System.err.println("HERE");
            assertTrue(true);
        } else {
              assertTrue(false);
          }
    }
}

Does anyone have any ideas? The test always passes...

Edit: I'm not sure if this is an error that deserves a new post or not, but running with the annotaion @RunWith(SpringRunner.class) yields the error RulesTest.testSaveOneRule ? IllegalState Failed to load ApplicationContext... RulesTest.testSaveOneRule ? IllegalState Failed to load ApplicationContext...

The content of MyApplication.class

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

Answer 1

For testing Repositories you should have the annotations:

@DataJpaTest 
@RunWith(SpringRunner.class) 
@SpringBootTest(classes=MyApplication.class)

Answer 2

I am noticing that you are missing this annotation @RunWith(SpringRunner.class)

I was following this page and I could do it https://grokonez.com/testing/datajpatest-with-spring-boot

Answer 3

if you are using JPA add in class Test @DataJpaTest. Ex.:

@DataJpaTest
public class CategoriaServiceTest {
    
    @Autowired
    private CategoriaRepository repository;
    
    @Test
    public void test() {
        
        Categoria categoria = new Categoria(null, "Teste");
        
        Categoria categoriaSaved = repository.save(categoria);
        
        assertEquals(categoria.getNome(), "Jefferson");
    }

}

Answer 4

The solution for me (to be able and load the application context also) was to use the following annotation:

@RunWith(SpringRunner.class)
@DataJpaTest
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
public class TestDiscountRepository {
...