how to write junit test cases for controller in spring boot using mockito code example

Example: testing the web layer without authentication spring

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class SecuredControllerRestTemplateIntegrationTest {
 
    @Autowired
    private TestRestTemplate template;
 
    // ... other methods
 
    @Test
    public void givenAuthRequestOnPrivateService_shouldSucceedWith200() throws Exception {
        ResponseEntity<String> result = template.withBasicAuth("spring", "secret")
          .getForEntity("/private/hello", String.class);
        assertEquals(HttpStatus.OK, result.getStatusCode());
    }
}