@Test
public void testGetUserEntityByIdError() {

    diskUserDataStore.getUserEntityDetails(FAKE_USER_ID, mockUserDetailsDataStoreCallback);
    verify(mockUserCache).get(anyInt(), userCacheCallbackArgumentCaptor.capture());
    verifyZeroInteractions(mockUserDetailsDataStoreCallback);
    userCacheCallbackArgumentCaptor.getValue().onError(any(Exception.class));
    verify(mockUserDetailsDataStoreCallback).onError(any(Exception.class));
}