JUnit Testing with Google App Engine dev server

I'm new to GAE and trying to setup a few JUnit tests. In this example provided by Google:

public class LocalDatastoreTest {

private final LocalServiceTestHelper helper =
    new LocalServiceTestHelper(new LocalDatastoreServiceTestConfig());

@Before
public void setUp() {
    helper.setUp();
}

@After
public void tearDown() {
    helper.tearDown();
}

// run this test twice to prove we're not leaking any state across tests
private void doTest() {
    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    assertEquals(0, ds.prepare(new Query("yam")).countEntities(withLimit(10)));
    ds.put(new Entity("yam"));
    ds.put(new Entity("yam"));
    assertEquals(2, ds.prepare(new Query("yam")).countEntities(withLimit(10)));
}

@Test
public void testInsert1() {
    doTest();
}

@Test
public void testInsert2() {
    doTest();
}

}

the following line is used to add an Entity to the local datastore:

ds.put(new Entity("yam"));

That works just fine for me. However, I'm using 开发者_StackOverflowJDO and want to persist one my own POJOs (e.g. Cars) but Cars is not of type Entity, which is what this method requires. Is there a different method or service I can use to accomplish this?

maybe you could use objectify-appengine.. for example

package com.intranet.entity;
import com.googlecode.objectify.annotation.Entity;
import com.googlecode.objectify.annotation.Id;
import com.googlecode.objectify.annotation.Index;

@Entity
public class Voto { 
@Id Long id;
@Index String email;
@Index String actividad;

public Voto(){}
public Voto(String email, String actividad) {
    this.email = email;
    this.actividad = actividad;
}

public String getEmail() {
    return email;
}
public void setEmail(String email) {
    this.email = email;
}
public String getActividad() {
    return actividad;
}
public void setActividad(String actividad) {
    this.actividad = actividad;
}   
}

TEST

public class VotoTest {

private final static LocalServiceTestHelper helper = new LocalServiceTestHelper(
            new LocalDatastoreServiceTestConfig());

@Before
public void setUp() {
        helper.setUp();
}

@After
public void tearDown() {
        helper.tearDown();
}

@Test
public void testEmbedded(){
         DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
         Voto voto1 = new Voto("test@localhost","actividad1");
         ofy().save().entity(voto1).now(); 
         assertEquals(1, ds.prepare(new Query("Voto")).countEntities(withLimit(10)));             

 } 
 }

It works perfectly