RegistryEndpointProvider<Optional<URL>> initializer() {
    return new Initializer();
  }
@Test
  public void testInitializer_handleResponse_created() throws IOException, RegistryException {
    Mockito.when(mockResponse.getStatusCode()).thenReturn(201); // Created
    Assert.assertFalse(testBlobPusher.initializer().handleResponse(mockResponse).isPresent());
  }