Junit Test using SpringJUnit4ClassRunner - spring

Question

I am trying to create junit test case using SpringJUnit4ClassRunner.
#Configuration
#ComponentScan(basePackages = { "com.controller",
"com.service",
"com.repository" })
class CustomConfiguration {
}
#RunWith(SpringJUnit4ClassRunner.class)
#org.springframework.test.context.ContextConfiguration(classes = CustomConfiguration.class)
public class Test {
#InjectMocks
#Spy
private EmployeeController employeeController;
#Mock
EmployeeService employeeService;
#Before
public void initMocks() {
MockitoAnnotations.initMocks(this);
}
#org.junit.Test
public void test() throws Exception {
Employee employee = new Employee();
employee.setEmailId("admin#gmail.com");
employee.setFirstName("admin");
employee.setLastName("admin");
Employee employee = employeeController.createEmployee(employee);
assertNotNull(employee);
}
}
It is giving error of No qualifying bean of type EmployeeRepository.

Answer 1

It seems that even tough you are having a custom configuration class for your test, the repository beans are not getting created in background through classpath scanning. If you are aiming for an integration test case rather than a junit one since you doesn't seem to mock anything in the code that you provided , why don't you try using more updated annotation version like using SpringRunner.class instead of SpringJunit4Runner.class , if your spring version supports it. If you are just aiming to create a unit test case. Create a mock bean for whatever you want to mock like :
#Mock
SomeRepository repo;
This mock should be automatically injected to your service beans when it starts up by junit.
If you are on springboot then:
#RunWith(SpringRunner.class)
#SpringBootTest
public class Test {
#Mock
EmployeeService employeeService;
#InjectMocks
private EmployeeController employeeController;
#org.junit.Test
public void test() throws Exception {
Employee employee = new Employee();
employee.setEmailId("admin#gmail.com");
employee.setFirstName("admin");
employee.setLastName("admin");
when(employeeService.save(any)).thenReturn(employee);
Employee employee = employeeController.createEmployee(employee);
assertNotNull(employee);
}
}
The above is a typical example for unit test in springboot , but in your case for controller classes springboot provides the annotation #WebMvcTest or unit testing the web layer only.If you want to do it like that , read doc.