@Test
public void partitionPresentOnlyInSource() {

    RangeComparator comparator = comparator(context(0L, 100L));
    RangeStats stats = comparator.compare(keys(0, 1, 2), keys(0, 1), this::alwaysMatch);
    assertFalse(stats.isEmpty());
    assertEquals(1, stats.getOnlyInSource());
    assertEquals(0, stats.getOnlyInTarget());
    assertEquals(2, stats.getMatchedPartitions());
    assertReported(2, MismatchType.ONLY_IN_SOURCE, mismatches);
    assertNothingReported(errors, journal);
    assertCompared(0, 1);
}