Spring Cloud Contract EXPLICIT and WEBTESTCLIENT testMode

Question

I want to use Spring Cloud Contract to produce my contracts and verify them. I want to use Spring WebFlux and Junit5. This is my Controller:

@RestController
@Slf4j
public class HelloWorldPortRESTAdapter implements HelloWorldPort {

    @GetMapping(value = "/hello-world", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    @Override
    public Mono<String> helloWorld() {
        return Mono.just("Hello World!");
    }
}

This is cloud contract maven plugin configuration:

            <plugin>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-contract-maven-plugin</artifactId>
                <extensions>true</extensions>
                <configuration>
                    <basePackageForTests>com.example.feedproviderapi.contract</basePackageForTests>
                    <testFramework>JUNIT5</testFramework>
                    <testMode>EXPLICIT</testMode>
                </configuration>
            </plugin>

But i don't know how base test class should look like. I tried this:

@ExtendWith(SpringExtension.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class BaseTestClass {

    @LocalServerPort
    private int port;

    @BeforeEach
    void setup(){
        RestAssured.baseURI = "http://localhost:" + this.port;
    }

}

When I run mvn clean install, it returns java.net.ConnectException: Connection refused (Connection refused)

Then I changed testMode property in maven plugin to WEBTESTCLIENT and updated BaseTestClass like this:

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class BaseTestClass {

    @Autowired
    WebApplicationContext context;

    @BeforeEach
    void setup(){
        RestAssuredWebTestClient.standaloneSetup(context);
    }

}

And again when I run mvn clean install now it returns:

You haven't configured a WebTestClient instance. You can do this statically

RestAssuredWebTestClient.mockMvc(..)
RestAssuredWebTestClient.standaloneSetup(..);
RestAssuredWebTestClient.webAppContextSetup(..);

or using the DSL:

given().
        mockMvc(..). ..

Btw I tried RestAssuredWebTestClient.standaloneSetup(new HelloWorldPortRESTAdapter()); as well in my BaseTestClass but the result is same.

So how should I implement BaseTestClass regarding EXPLICIT and WEBTESTCLIENT testModes?

Answer 1

I have struggled for 3 days, to makes RestAssuredWebTestClient works.

Thanks a llooottt for : https://www.baeldung.com/spring-5-webclient

That's how i could do that:

@WebFluxTest
public class AnimeControllerIntegrTest{

    WebTestClient testClient;

    @Test
    public void get_RA() {

        testClient = WebTestClient.bindToServer().baseUrl("http://localhost:8080/animes").build();

        RestAssuredWebTestClient
                .given()
                .webTestClient(testClient)

                .when()
                .get()

                .then()
                .statusCode(OK.value())

                .body("name" ,hasItem("paulo"))
        ;
    }

}

Answer 2

Try passing an ApplicationContext instance instead of WebApplicationContext.

Answer 3

Please check the spring cloud contract samples https://github.com/spring-cloud-samples/spring-cloud-contract-samples/blob/master/producer_webflux_webtestclient

And junit5

https://github.com/spring-cloud-samples/spring-cloud-contract-samples/tree/master/producer_with_junit5

The

plugin 



<plugin>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-contract-maven-plugin</artifactId>
            <version>${spring-cloud-contract.version}</version>
            <extensions>true</extensions>
            <configuration>
                <packageWithBaseClasses>com.example</packageWithBaseClasses>
                <testMode>WEBTESTCLIENT</testMode>
            </configuration>
        </plugin>

<plugin>
            <artifactId>maven-surefire-plugin</artifactId>
            <configuration>
                <failIfNoTests>true</failIfNoTests>
            </configuration>
            <dependencies>
                <dependency>
                    <groupId>org.junit.platform</groupId>
                    <artifactId>junit-platform-surefire-provider</artifactId>
                    <version>${junit-platform-surefire-provider.version}</version>
                </dependency>
            </dependencies>
        </plugin>

And The base class for junit5

public abstract class BeerRestBase {

@BeforeEach
public void setup() {
    // remove::start[]
    RestAssuredWebTestClient.standaloneSetup(new ProducerController(personToCheck -> personToCheck.age >= 20));
    // remove::end[]
}

}