diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_data_protocol.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_data_protocol.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* run some tests on the data: protocol handler */
+
+// The behaviour wrt spaces is:
+// - Textual content keeps all spaces
+// - Other content strips unescaped spaces
+// - Base64 content strips escaped and unescaped spaces
+var urls = [
+  ["data:,foo",                                     "text/plain",               "foo"],
+  ["data:application/octet-stream,foo bar",         "application/octet-stream", "foobar"],
+  ["data:application/octet-stream,foo%20bar",       "application/octet-stream", "foo bar"],
+  ["data:application/xhtml+xml,foo bar",            "application/xhtml+xml",    "foo bar"],
+  ["data:application/xhtml+xml,foo%20bar",          "application/xhtml+xml",    "foo bar"],
+  ["data:text/plain,foo%00 bar",                    "text/plain",               "foo\x00 bar"],
+  ["data:text/plain;base64,Zm9 vI%20GJ%0Dhc%0Ag==", "text/plain",               "foo bar"],
+  ["DATA:TEXT/PLAIN;BASE64,Zm9 vI%20GJ%0Dhc%0Ag==", "text/plain",               "foo bar"],
+  // Bug 774240
+  ["data:application/octet-stream;base64=y,foobar", "application/octet-stream", "foobar"],
+  // Bug 781693
+  ["data:text/plain;base64;x=y,dGVzdA==",           "text/plain",               "test"]
+];
+
+function run_test() {
+  dump("*** run_test\n");
+
+  function on_read_complete(request, data, idx) {
+    dump("*** run_test.on_read_complete\n");
+
+    if (request.nsIChannel.contentType != urls[idx][1])
+      do_throw("Type mismatch! Is <" + chan.contentType + ">, should be <" + urls[idx][1] + ">");
+
+    /* read completed successfully.  now compare the data. */
+    if (data != urls[idx][2])
+      do_throw("Stream contents do not match with direct read! Is <" + data + ">, should be <" + urls[idx][2] + ">");
+    do_test_finished();
+  }
+
+  var ios = Cc["@mozilla.org/network/io-service;1"].
+            getService(Ci.nsIIOService);
+  for (var i = 0; i < urls.length; ++i) {
+    dump("*** opening channel " + i + "\n");
+    do_test_pending();
+    var chan = ios.newChannel(urls[i][0], "", null);
+    chan.contentType = "foo/bar"; // should be ignored
+    chan.asyncOpen(new ChannelListener(on_read_complete, i), null);
+  }
+}
+