From 618f7ff07aa13afd3aa9c9d2533a9917e0f3b8c4 Mon Sep 17 00:00:00 2001
From: jst <janschlicht@gmail.com>
Date: Fri, 27 Mar 2015 19:48:18 +0100
Subject: [PATCH] Add test case for correct pixel coordinates after resize.

---
 resize_test.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/resize_test.go b/resize_test.go
index 3ba03f2..efe3fa0 100644
--- a/resize_test.go
+++ b/resize_test.go
@@ -85,6 +85,26 @@ func Test_SameSizeReturnsOriginal(t *testing.T) {
 	}
 }
 
+func Test_PixelCoordinates(t *testing.T) {
+	checkers := image.NewGray(image.Rect(0, 0, 4, 4))
+	checkers.Pix = []uint8{
+		255, 0, 255, 0,
+		0, 255, 0, 255,
+		255, 0, 255, 0,
+		0, 255, 0, 255,
+	}
+
+	resized := Resize(12, 12, checkers, NearestNeighbor).(*image.Gray)
+
+	if resized.Pix[0] != 255 || resized.Pix[1] != 255 || resized.Pix[2] != 255 {
+		t.Fail()
+	}
+
+	if resized.Pix[3] != 0 || resized.Pix[4] != 0 || resized.Pix[5] != 0 {
+		t.Fail()
+	}
+}
+
 const (
 	// Use a small image size for benchmarks. We don't want memory performance
 	// to affect the benchmark results.