@Test
public void testCompleted() throws Exception {

    final Registry<String> reg = RegistryBuilder.<String>create().register("Stuff", "Stuff").build();
    Assert.assertEquals("Stuff", reg.lookup("Stuff"));
    Assert.assertEquals("Stuff", reg.lookup("stuff"));
    Assert.assertEquals(null, reg.lookup("miss"));
    Assert.assertEquals(null, reg.lookup(null));
}