image.Rect(23, 23, 55, 86),
		image.Rect(44, 44, 87, 58),
		image.Pt(10, 10),
		image.Pt(11, 11),
		false,
		image.Rect(33, 33, 45, 47),
		image.Pt(43, 43),
		image.Pt(44, 44),
	},
}

func TestClip(t *testing.T) {
	dst0 := image.NewRGBA(image.Rect(0, 0, 100, 100))
	src0 := image.NewRGBA(image.Rect(0, 0, 100, 100))
	mask0 := image.NewRGBA(image.Rect(0, 0, 100, 100))
	for _, c := range clipTests {

	var gotPanic bool
	func() {
		defer func() { gotPanic = recover() != nil }()
		_ = Grow(s1, -1)
	}()
	if !gotPanic {
		t.Errorf("Grow(-1) did not panic; expected a panic")
	}
}

func TestClip(t *testing.T) {
	s1 := []int{1, 2, 3, 4, 5, 6}[:3]
	orig := Clone(s1)
	if len(s1) != 3 {
		t.Errorf("len(%v) = %d, want 3", s1, len(s1))
	}
	if cap(s1) < 6 {