Can't Autowire JpaRepository in Junit test - Spring boot application

Question

Hi All I’m trying to execute a Junit test in a Spring boot application, the Junit should test some CRUD operations, I’m using Spring Repositories specifically JpaRepository. The Repository calss: ``` package au.com.bla.bla.bla.repository; import org.springframework.data.jpa.repository.JpaRepository; import au.com.bla.bla.bla.entity.Todo; public interface TodoRepository extends JpaRepository<Todo, Integer> { } ``` TodoController class ``` package au.com.bla.bla.bla.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.CrossOrigin; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import au.com.bla.bla.bla.entity.Todo; import au.com.bla.bla.bla.repository.TodoReposi…

Accepted Answer

Your error is actually the expected behavior of `@WebMvcTest`. You basically have 2 options to perform tests on your controller.

1. @WebMvcTest - need to use @MockBean

With `@WebMvcTest`, a minimal spring context is loaded, just enough to test the web controllers. This means that your Repository isn't available for injection:

Spring documentation:

`@WebMvcTest` will auto-configure the Spring MVC infrastructure and limit scanned beans to @Controller, @ControllerAdvice, @JsonComponent, Filter, WebMvcConfigurer and HandlerMethodArgumentResolver.

Assuming the goal is just to test the Controller, you should inject your repository as a mock using `@MockBean`.

You could have something like:

```
@RunWith(SpringRunner.class)
@WebMvcTest(TodoController.class)
public class TodoControllerTest {

@Autowired
    private MockMvc mvc;

@Autowired
    private TodoController subject;

@MockBean
    private TodoRepository todoRepository;

@Test
    public void testCreate() throws Exception {
    String json = "{\"text\":\"a new todo\"}";

mvc.perform(post("/todo").content(json)
                             .contentType(APPLICATION_JSON)
                             .accept(APPLICATION_JSON))
       .andExpect(status().isOk())
       .andExpect(jsonPath("$.id").value(3))
       .andExpect(jsonPath("$.text").value("a new todo"))
       .andExpect(jsonPath("$.completed").value(false));

Mockito.verify(todoRepository, Mockito.times(1)).save(any(Todo.class));
    }
}
```

2. @SpringBootTest - you can @Autowire beans

If you want to load the whole application context, then use `@SpringBootTest`: http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-testing.html

You'd have something like this:

```
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class TodoControllerTest {

private MockMvc mvc;

@Autowired
    TodoController subject;

@Autowired
    private WebApplicationContext context;

@Before
    public void setup() {
        this.mvc = MockMvcBuilders.webAppContextSetup(context).build();
    }

@Test
    public void testNoErrorSanityCheck() throws Exception {
        String json = "{\"text\":\"a new todo\"}";

mvc.perform(post("/todo").content(json)
                .contentType(APPLICATION_JSON)
                .accept(APPLICATION_JSON))
        .andExpect(status().isOk())
        .andExpect(jsonPath("$.id").value(3))
        .andExpect(jsonPath("$.text").value("a new todo"))
        .andExpect(jsonPath("$.completed").value(false));

assertThat(subject.getTodos()).hasSize(4);
    }
}
```

Can't Autowire JpaRepository in Junit test - Spring boot application

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