@Test
void shouldDelegateLogResponse() throws IOException {

    final HttpLogFormatter fallback = mock(HttpLogFormatter.class);
    final HttpLogFormatter unit = new CurlHttpLogFormatter(fallback);
    final MockHttpResponse response = MockHttpResponse.create();
    final Correlation correlation = new SimpleCorrelation("3881ae92-6824-11e5-921b-10ddb1ee7671", MIN, MIN);
    unit.format(correlation, response);
    verify(fallback).format(correlation, response);
}