diff -r 000000000000 -r 6474c204b198 layout/base/tests/bidi_numeral_test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/base/tests/bidi_numeral_test.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,97 @@
+// Canvas related code stolen from http://developer.mozilla.org/en/docs/Code_snippets:Canvas
+var RemoteCanvas = function(url, id) {
+    this.url = url;
+    this.id = id;
+    this.snapshot = null;
+};
+
+RemoteCanvas.CANVAS_WIDTH = 200;
+RemoteCanvas.CANVAS_HEIGHT = 100;
+
+RemoteCanvas.prototype.compare = function(otherCanvas, expected) {
+    return compareSnapshots(this.snapshot, otherCanvas.snapshot, expected)[0];
+}
+
+RemoteCanvas.prototype.load = function(callback) {
+  var iframe = document.createElement("iframe");
+  iframe.id = this.id + "-iframe";
+  iframe.width = RemoteCanvas.CANVAS_WIDTH + "px";
+  iframe.height = RemoteCanvas.CANVAS_HEIGHT + "px";
+  iframe.src = this.url;
+  var me = this;
+  iframe.addEventListener("load", function() {
+      me.remotePageLoaded(callback);
+    }, false);
+  window.document.body.appendChild(iframe);
+};
+
+RemoteCanvas.prototype.remotePageLoaded = function(callback) {
+  var ldrFrame = document.getElementById(this.id + "-iframe");
+  this.snapshot = snapshotWindow(ldrFrame.contentWindow);
+  callback(this);
+};
+
+function bidiNumeral(val) {
+  if (typeof val == "undefined")
+    return SpecialPowers.getIntPref("bidi.numeral");
+  else
+    SpecialPowers.setIntPref("bidi.numeral", val);
+}
+
+var bidiNumeralDefault = bidiNumeral();
+
+var currentPass = 0;
+
+function run()
+{
+  SimpleTest.waitForExplicitFinish();
+
+  do_test();
+}
+
+function do_test()
+{
+  var canvases = [];
+  function callbackTestCanvas(canvas)
+  {
+    canvases.push(canvas);
+
+    if (canvases.length == 2) { // when both canvases are loaded
+      if (passes[currentPass].op == "==") {
+        ok(canvases[0].compare(canvases[1], true), "Rendering of reftest " + fileprefix + passes[currentPass].file +
+           " is different with bidi.numeral == " + passes[currentPass].bidiNumeralValue);
+      } else if (passes[currentPass].op == "!=") {
+        ok(canvases[0].compare(canvases[1], false), "Rendering of reftest " + fileprefix + passes[currentPass].file +
+           " is not different with bidi.numeral == " + passes[currentPass].bidiNumeralValue);
+      }
+
+      bidiNumeral(bidiNumeralDefault);
+
+      if (currentPass < passes.length - 1) {
+        ++currentPass;
+        do_test();
+      } else {
+        SimpleTest.finish();
+      }
+    }
+  }
+
+  var fileprefix = passes[currentPass].prefix + "-";
+  var file = passes[currentPass].file;
+
+  var header = document.createElement("p");
+  header.appendChild(document.createTextNode("Testing reftest " + fileprefix + file +
+    " with bidi.numeral == " + passes[currentPass].bidiNumeralValue +
+    " expecting " + passes[currentPass].op));
+  document.body.appendChild(header);
+
+  bidiNumeral(passes[currentPass].bidiNumeralValue);
+
+  var testCanvas = new RemoteCanvas(fileprefix + file + ".html", "test-" + currentPass);
+  testCanvas.load(callbackTestCanvas);
+
+  var refCanvas = new RemoteCanvas(fileprefix + file + "-ref.html", "ref-" + currentPass);
+  refCanvas.load(callbackTestCanvas);
+}
+
+run();