@Test
public void testHistogram() {
CodahaleMetrics codahaleMetrics = new CodahaleMetrics(configurationProperties, reservoirFactory);
when(reservoirFactory.newInstance(com.codahale.metrics.Histogram.class, "histo")).thenReturn(reservoir);
Histogram histogram = codahaleMetrics.histogram("histo");
verify(reservoirFactory, times(1)).newInstance(com.codahale.metrics.Histogram.class, "histo");
assertNotNull(histogram);
}