DDMRESTDataProvider implements DDMDataProvider { protected String getCacheKey(HttpRequest httpRequest) { return httpRequest.url(); }  @Override DDMDataProviderResponse getData(
			DDMDataProviderRequest ddmDataProviderRequest); @Override Class<?> getSettings();  }
@Test public void testGetCacheKey() { HttpRequest httpRequest = mock(HttpRequest.class); HttpRequest spy = spy(httpRequest); _ddmRESTDataProvider.getCacheKey(spy); Mockito.verify( spy, Mockito.times(1) ).url(); }