Playing around with a simple stub of a jersey client

jersey.java

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientHandlerException;
import com.sun.jersey.api.client.ClientRequest;
import com.sun.jersey.api.client.ClientResponse;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class RandomTest {
    @Test
    public void jerseyFailingExample() {
        Client client = client().requestFor("http://www.google.com").returns(500).create();
        String result = new Foo(client).doSomething();
        assertEquals("fail", result);
    }

    @Test
    public void jerseyWinningExample() {
        Client client = client().requestFor("http://www.google.com").returns(200).create();
        String result = new Foo(client).doSomething();
        assertEquals("win", result);
    }

    private ClientBuilder client() {
        return new ClientBuilder();
    }

    class ClientBuilder {

        private String uri;
        private int statusCode;

        public ClientBuilder requestFor(String uri) {
            this.uri = uri;
            return this;
        }

        public ClientBuilder returns(int statusCode) {
            this.statusCode = statusCode;
            return this;
        }

        public Client create() {
            return new Client() {
                public ClientResponse handle(ClientRequest request) throws ClientHandlerException {
                    if(request.getURI().toString().equals(uri)) {
                        return new ClientResponse(statusCode, null, null, null);
                    }
                    throw new RuntimeException("No stub provided for " + request.getMethod() + " " + request.getURI());
                }
            };
        }
    }

    class Foo {
        private Client httpClient;

        public Foo(Client httpClient) {
            this.httpClient = httpClient;
        }

        public String doSomething() {
            ClientResponse response = httpClient.resource("http://www.google.com").get(ClientResponse.class);
            if(response.getStatus() >= 100 && response.getStatus() < 400) {
                return "win";
            } else {
                return "fail";
            }
        }
    }
}