@Test
    public void testExactness() {
        assertMetrics("exactness:1",     "a b c","a x b x x c");
        assertMetrics("exactness:0.9",   "a b c","a x b:0.7 x x c");
        assertMetrics("exactness:0.7",   "a b c","a x b:0.6 x x c:0.5");
        assertMetrics("exactness:0.775", "a!200 b c","a x b:0.6 x x c:0.5");
        assertMetrics("exactness:0.65",  "a b c!200","a x b:0.6 x x c:0.5");
    }
Tests exactness (using field exactness only - nothing additional of interest to test with query exactness
as that is just another number multiplied with the term exactness)
searchlib/src/test/java/com/yahoo/searchlib/ranking/features/fieldmatch/test/FieldMatchMetricsTestCase.java