예제 #1
0
func TestIntersectionWith(t *testing.T) {
	// Edge cases: the pairs (1,1), (1000,2000), (8000,4000)
	// exercise the <, >, == cases in IntersectionWith that the
	// TestSetOperations data is too dense to cover.
	var X, Y intsets.Sparse
	X.Insert(1)
	X.Insert(1000)
	X.Insert(8000)
	Y.Insert(1)
	Y.Insert(2000)
	Y.Insert(4000)
	X.IntersectionWith(&Y)
	if got, want := X.String(), "{1}"; got != want {
		t.Errorf("IntersectionWith: got %s, want %s", got, want)
	}
}
예제 #2
0
func TestIntersects(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.IntersectionWith(y)

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

		// make it false
		a := x.AppendTo(nil)
		for _, v := range a {
			y.Remove(v)
		}

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

		// make it true
		if x.IsEmpty() {
			continue
		}
		i := prng.Intn(len(a))
		y.Insert(a[i])

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