### Question:
HelidonMeter extends MetricImpl implements Meter { @Override public double getMeanRate() { return delegate.getMeanRate(); } private  HelidonMeter(String type, Metadata metadata, Meter delegate); @Override void prometheusData(StringBuilder sb, MetricID metricID, boolean withHelpType); @Override String prometheusValue(); @Override void jsonData(JsonObjectBuilder builder, MetricID metricID); @Override void mark(); @Override void mark(long n); @Override long getCount(); @Override double getFifteenMinuteRate(); @Override double getFiveMinuteRate(); @Override double getMeanRate(); @Override double getOneMinuteRate(); @Override boolean equals(Object o); @Override int hashCode();  }### Answer:
@Test void testMeanRate() { assertThat("mean rate", meter.getMeanRate(), is(withinTolerance(100))); }