t.Errorf("minFold=%#U should be %#U", minFold, i)
		}
		last = i
	}
	if maxFold != last {
		t.Errorf("maxFold=%#U should be %#U", maxFold, last)
	}
}

func TestAppendRangeCollapse(t *testing.T) {
	// AppendRange should collapse each of the new ranges
	// into the earlier ones (it looks back two ranges), so that
	// the slice never grows very large.
	// Note that we are not calling cleanClass.