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Question

My aim is to learn a little bit about mocking objects in the context of Jersey Test.
I have 3 classes:

ServiceController

package com.vogella.jersey.first;

import javax.ws.rs.*;
import javax.ws.rs.ext.Provider;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ServiceController {

    private static Log log = LogFactory.getLog(ServiceController.class);

    public String returnSth(String inSth) {
        return "returned RET" + inSth;
    }

}

Hello

package com.vogella.jersey.first;

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("/hello")
public class Hello {

    @Inject
    private ServiceController serviceController;

    private String inStr = "BLA";

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String sayPlainTextHello() {
        return "Hello Jersey" + serviceController.returnSth(inStr);
    }

    @GET
    @Produces(MediaType.TEXT_XML)
    public String sayXMLHello() {
        return "<?xml version="1.0"?>" + "<hello> Hello Jersey" + "</hello>";
    }

    @GET
    @Produces(MediaType.TEXT_HTML)
    public String sayHtmlHello() {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
                + "<body><h1>" + "Hello Jersey" + serviceController.returnSth(inStr) + "</body></h1>" + "</html> ";
    }

}

HelloTest

package com.vogella.jersey.first;

import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.test.JerseyTest;
import org.junit.jupiter.api.Test;

import javax.ws.rs.core.Application;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertTrue;
import static org.mockito.Mockito.*;

class HelloTest extends JerseyTest {

    private ServiceController serviceController;

    @Override
    protected Application configure() {
        ResourceConfig config = new ResourceConfig(Hello.class);
        serviceController = mock(ServiceController.class);
        config.register(new AbstractBinder() {
            @Override
            protected void configure() {
                bind(ServiceController.class).to(ServiceController.class);
            }
        }
        );
        return config;
    }

    @Test
    public void helloResponseCodeOK() {
        Response response = target("hello").request()
                .get();

        assertEquals("Http Response should be 200: ", Response.Status.OK.getStatusCode(), response.getStatus());

    }

    @Test
    public void helloResponseTextIsCorrect() {
        when(serviceController.returnSth(any(String.class))).thenReturn("RetFromMock");

        Response response = target("hello").request(MediaType.TEXT_PLAIN)
                .get();

        assertTrue("Hello Jerseyreturned RETBLA".equals(response.readEntity(String.class)));

    }

}

So in the Hello class there is a “hello” endpoint and in 2 methods there is a call to a “returnSth” method from the injected ServiceController.

In HelloTest I wanted to test the “hello” endpoint but without calling the real serviceController.returnSth method – instead wanted to mock it and return some other string – “RetFromMock” regardless of the input.

However during the test execution the mocking is ineffective and still the real one is getting called. I would expect the assertTrue to fail, because if the mock would get called, the response output should be “Hello JerseyRetFromMock” but is always “Hello Jerseyreturned RETBLA”.

I was trying different ways of instantiating the mock:

Injecting:

@Inject
private ServiceController serviceController;

Mocking with annotations:

@Mock
private ServiceController serviceController;

@InjectMocks
private ServiceController serviceController;

Those attempts were resulting in NullPointerException (serviceController was null).
The above I tried also with @RunWith(MockitoJUnitRunner.class) annotation with the same result.

I also tried to follow the example from this link:
https://medium.com/@mnu/overriding-dependency-injection-with-hk2-in-jersey-tests-4756144c2399

but was never able to get the “bind(serviceController).to(ServiceController.class)” to work – failing with IllegalArgumentException.

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Danh mục

JerseyTest and Mockito – problem with mocking an object