1 files changed, 71 insertions, 0 deletions
diff --git a/src/pkg/image/image_test.go b/src/pkg/image/image_test.go
new file mode 100644
index 000000000..17e314795
--- /dev/null
+++ b/src/pkg/image/image_test.go
@@ -0,0 +1,71 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package image
+
+import (
+	"testing"
+)
+
+func cmp(t *testing.T, cm ColorModel, c0, c1 Color) bool {
+	r0, g0, b0, a0 := cm.Convert(c0).RGBA()
+	r1, g1, b1, a1 := cm.Convert(c1).RGBA()
+	return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1
+}
+
+func TestImage(t *testing.T) {
+	type buffered interface {
+		Image
+		Set(int, int, Color)
+		SubImage(Rectangle) Image
+	}
+	testImage := []Image{
+		NewRGBA(10, 10),
+		NewRGBA64(10, 10),
+		NewNRGBA(10, 10),
+		NewNRGBA64(10, 10),
+		NewAlpha(10, 10),
+		NewAlpha16(10, 10),
+		NewGray(10, 10),
+		NewGray16(10, 10),
+		NewPaletted(10, 10, PalettedColorModel{
+			Transparent,
+			Opaque,
+		}),
+	}
+	for _, m := range testImage {
+		b := m.(buffered)
+		if !Rect(0, 0, 10, 10).Eq(b.Bounds()) {
+			t.Errorf("%T: want bounds %v, got %v", b, Rect(0, 0, 10, 10), b.Bounds())
+			continue
+		}
+		if !cmp(t, b.ColorModel(), Transparent, b.At(6, 3)) {
+			t.Errorf("%T: at (6, 3), want a zero color, got %v", b, b.At(6, 3))
+			continue
+		}
+		b.Set(6, 3, Opaque)
+		if !cmp(t, b.ColorModel(), Opaque, b.At(6, 3)) {
+			t.Errorf("%T: at (6, 3), want a non-zero color, got %v", b, b.At(6, 3))
+			continue
+		}
+		b = b.SubImage(Rect(3, 2, 9, 8)).(buffered)
+		if !Rect(3, 2, 9, 8).Eq(b.Bounds()) {
+			t.Errorf("%T: sub-image want bounds %v, got %v", b, Rect(3, 2, 9, 8), b.Bounds())
+			continue
+		}
+		if !cmp(t, b.ColorModel(), Opaque, b.At(6, 3)) {
+			t.Errorf("%T: sub-image at (6, 3), want a non-zero color, got %v", b, b.At(6, 3))
+			continue
+		}
+		if !cmp(t, b.ColorModel(), Transparent, b.At(3, 3)) {
+			t.Errorf("%T: sub-image at (3, 3), want a zero color, got %v", b, b.At(3, 3))
+			continue
+		}
+		b.Set(3, 3, Opaque)
+		if !cmp(t, b.ColorModel(), Opaque, b.At(3, 3)) {
+			t.Errorf("%T: sub-image at (3, 3), want a non-zero color, got %v", b, b.At(3, 3))
+			continue
+		}
+	}
+}