when(configuration.getStringValue(anyString())).thenAnswer(new Answer<Value<String>>() {
@Override
public Value<String> answer(InvocationOnMock invocation) throws Throwable {
when(configuration.getStringValue(anyString())).thenAnswer(new Answer<Value<String>>() {
@Override
public Value<String> answer(InvocationOnMock invocation) throws Throwable {