@Deployment
public static WebArchive createDeployment() {
    WebArchive war = ShrinkWrap.create(WebArchive.class)
                               .addPackage("org.javaee7.jpa.jndi.context")
                               .addAsResource("META-INF/persistence.xml")
                               .addAsResource("META-INF/load.sql");
    System.out.println(war.toString(true));
    return war;
}

@Test
public void testEntityManagerLookup() throws Exception {
    InitialContext context = new InitialContext();
    EntityManager entityManager = (EntityManager) context.lookup("java:comp/env/persistence/myJNDI");
    assertNotNull(entityManager);

    List<Employee> employees = entityManager.createNamedQuery("Employee.findAll", Employee.class).getResultList();
    assertFalse(employees.isEmpty());
    assertEquals(8, employees.size());
}

@Test
public void testEntityManagerLookupBean() throws Exception {
    List<Employee> employees = employeeBean.get();
    assertFalse(employees.isEmpty());
    assertEquals(8, employees.size());
}