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)
}
}