if !ok {
			continue
		}
		i := x.IsInt()
		e := x.Denom().Cmp(one) == 0
		if i != e {
			t.Errorf("got IsInt(%v) == %v; want %v", x, i, e)
		}
	}
}

func TestRatAbs(t *testing.T) {
	zero := new(Rat)
	for _, a := range setStringTests {
		x, ok := new(Rat).SetString(a.in)
		if !ok {
			continue
		}
		e := new(Rat).Set(x)
		if e.Cmp(zero) < 0 {
			e.Sub(zero, e)