@Test
    final void testGetAllMetricNames() {
        twoMetricsUniqueDimensions();
        Collection<String> names = bucket.getAllMetricNames();
        assertEquals(2, names.size());
        assertTrue(names.contains("nalle"));
        assertTrue(names.contains("nalle2"));
    }
Functional tests for the value buckets, as implemented in the class Bucket,
and by extension the value store itself, UntypedValue.

@author Steinar Knutsen
container-core/src/test/java/com/yahoo/metrics/simple/BucketTest.java