@Test
public void reportsGaugeValues() throws Exception {

    final Gauge gauge = mock(Gauge.class);
    when(gauge.getValue()).thenReturn(1);
    reporter.report(map("gauge", gauge),
            this.<Counter>map(),
            this.<Histogram>map(),
            this.<Meter>map(),
            this.<Timer>map());
    Assertions.assertThat(fileContents("gauge.csv"))
            .isEqualTo(csv(
                    "t,value",
                    "19910191,1"
            ));
}