Example #1
0
func TestSubsetOf(t *testing.T) {
	prng := rand.New(rand.NewSource(0))

	for i := uint(0); i < 12; i++ {
		X, Y := randomPset(prng, 1<<i), randomPset(prng, 1<<i)
		x, y := &X.bits, &Y.bits

		// test the slow way
		var z intsets.Sparse
		z.Copy(x)
		z.DifferenceWith(y)

		if got, want := x.SubsetOf(y), z.IsEmpty(); got != want {
			t.Errorf("SubsetOf: got %v, want %v", got, want)
		}

		// make it true
		y.UnionWith(x)

		if got, want := x.SubsetOf(y), true; got != want {
			t.Errorf("SubsetOf: got %v, want %v", got, want)
		}

		// make it false
		if x.IsEmpty() {
			continue
		}
		a := x.AppendTo(nil)
		i := prng.Intn(len(a))
		y.Remove(a[i])

		if got, want := x.SubsetOf(y), false; got != want {
			t.Errorf("SubsetOf: got %v, want %v", got, want)
		}
	}
}