[FIXED] Integration tests on spring-boot throws Connection refused

Issue

I have an unit test on Spring Boot:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = Application.class)
public class CustomerControllerIT {
    private RestTemplate restTemplate = new RestTemplate();
    @Test
    public void findAllCustomers() throws Exception {
        ResponseEntity<List<Customer>> responseEntity = restTemplate.exchange(
                "http://localhost:8080/Customer", HttpMethod.GET, null,
                new ParameterizedTypeReference<List<Customer>>() {
                });
        List<Customer> list = responseEntity.getBody();
        Assert.assertEquals(list.size(), 0);
    }
}

• If I launch test on started application - tests ok

• If I try to launch only IT, there is connection refused error

My application.properties is same for single start.

For tests and located in resources and testResources.

Application.class is:

@ComponentScan({"mypackage"})
@EntityScan(basePackages = {"mypackage.model"})
@EnableJpaRepositories(basePackages = {"mypackage.persistence"})
@SpringBootApplication
public class Application extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Solution

You must run a test with a running server ,

If you need to start a full running server, you can use random ports:

• @SpringBootTest(webEnvironment=WebEnvironment.RANDOM_PORT)

An available port is picked at random each time your test runs

You need this maven dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-test</artifactId>        
</dependency>

Example:

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

    @Autowired
    private TestRestTemplate restTemplate;

    @Test
    public void findAllCustomers() throws Exception {
        ResponseEntity<List<Customer>> responseEntity = restTemplate.exchange(
               "/Customer", HttpMethod.GET, null,
               new ParameterizedTypeReference<List<Customer>>(){});
        List<Customer> list = responseEntity.getBody();
        Assert.assertEquals(list.size(), 0);
    }
}

Please read the documentation for more reference

Answered By - Fernix