public class TestAuthenticate {
    Service service  = new Service();
    String username = "user";
    String password = "password";
    String token;

    @Test(expected = Exception.class)
    public final void testAuthenticateInputs() {
        password = "pass";
        service.authenticate(username, password);
    }

    @Test(expected = Exception.class)
    public final void testAuthenticateException(){
        username = null;
        String token = service.authenticate(username, password);
        assertNotNull(token);
    }

    @Test
    public final void testAuthenticateResult() {
        String token = service.authenticate(username, password);
        assertNotNull(token);
    }
}

public class MyResourceTest {

    public static final String BASE_URI = "http://localhost:8080/api/"
    private HttpServer server;

    @Before
    public void setUp() throws Exception {
        final ResourceConfig rc = new ResourceConfig(Service.class);
        server = GrizzlyHttpServerFactory.createHttpServer(URI.create(BASE_URI), rc);
    }

    @After
    public void tearDown() throws Exception {
        server.stop();
    }

    @Test
    public void testService() {
        Client client = ClientBuilder.newClient();
        WebTarget target = client.target(BASE_URI).path("service");
        ...
    }
}

<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-grizzly2-http</artifactId>
    <version>${jersey2.version}</version>
</dependency>

public class SimpleTest extends JerseyTest {

    @Override
    protected Application configure() {
        return new ResourceConfig(Service.class);
    }

    @Test
    public void test() {
        String hello = target("service").request().get(String.class);
    }
}

<dependency>
    <groupId>org.glassfish.jersey.test-framework.providers</groupId>
    <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
    <version>${jersey2.version}</version>
    <scope>test</scope>
</dependency>

import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.core.DefaultResourceConfig;
import com.sun.jersey.spi.container.servlet.WebComponent;
import com.sun.jersey.test.framework.JerseyTest;
import com.sun.jersey.test.framework.WebAppDescriptor;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import junit.framework.Assert;
import org.junit.Test;

public class SimpleTest extends JerseyTest {

    @Path("service")
    public static class Service {
        @GET
        public String getTest() { return "Hello World!"; }
    }

    public static class AppConfig extends DefaultResourceConfig {
        public AppConfig() {
            super(Service.class);
        }
    }

    @Override
    public WebAppDescriptor configure() {
        return new WebAppDescriptor.Builder()
                .initParam(WebComponent.RESOURCE_CONFIG_CLASS,
                           AppConfig.class.getName())
                .build();
    }

    @Test
    public void doTest() {
        WebResource resource = resource().path("service");
        String result = resource.get(String.class);
        Assert.assertEquals("Hello World!", result);
        System.out.println(result);
    }
}