@Test 
public void noBlueprintContainerServiceIds() throws Exception
{//It is impossible according to osgi spec, here just test the robustness of code

    mockery.checking(new Expectations() {
        {
            oneOf(mockContext).getServiceReferences(with(any(String.class)), with(any(String.class)));
            //return null if no services are registered which satisfy the search
            will(returnValue(null));
        }
    });
    assertNull(metadata.getBlueprintContainerServiceIds());
}