1 files changed, 29 insertions, 0 deletions
diff --git a/toolkit/components/thumbnails/test/browser_thumbnails_bug727765.js b/toolkit/components/thumbnails/test/browser_thumbnails_bug727765.js
new file mode 100644
index 000000000..c4faac685
--- /dev/null
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_bug727765.js
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URL = "http://mochi.test:8888/browser/toolkit/components/thumbnails/" +
+            "test/background_red_scroll.html";
+
+function isRedThumbnailFuzz(r, g, b, expectedR, expectedB, expectedG, aFuzz)
+{
+  return (Math.abs(r - expectedR) <= aFuzz) &&
+         (Math.abs(g - expectedG) <= aFuzz) &&
+         (Math.abs(b - expectedB) <= aFuzz);
+}
+
+// Test for black borders caused by scrollbars.
+function* runTests() {
+  // Create a tab with a page with a red background and scrollbars.
+  yield addTab(URL);
+  yield captureAndCheckColor(255, 0, 0, "we have a red thumbnail");
+
+  // Check the thumbnail color of the bottom right pixel.
+  yield whenFileExists(URL);
+  yield retrieveImageDataForURL(URL, function (aData) {
+    let [r, g, b] = [].slice.call(aData, -4);
+    let fuzz = 2; // Windows 8 x64 blends with the scrollbar a bit.
+    var message = "Expected red thumbnail rgb(255, 0, 0), got " + r + "," + g + "," + b;
+    ok(isRedThumbnailFuzz(r, g, b, 255, 0, 0, fuzz), message);
+    next();
+  });
+}