diff -r 000000000000 -r 6474c204b198 toolkit/devtools/sourcemap/tests/unit/test_dog_fooding.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/sourcemap/tests/unit/test_dog_fooding.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+/*
+ * WARNING!
+ *
+ * Do not edit this file directly, it is built from the sources at
+ * https://github.com/mozilla/source-map/
+ */
+
+Components.utils.import('resource://test/Utils.jsm');
+/* -*- Mode: js; js-indent-level: 2; -*- */
+/*
+ * Copyright 2011 Mozilla Foundation and contributors
+ * Licensed under the New BSD license. See LICENSE or:
+ * http://opensource.org/licenses/BSD-3-Clause
+ */
+define("test/source-map/test-dog-fooding", ["require", "exports", "module"], function (require, exports, module) {
+
+  var SourceMapConsumer = require('source-map/source-map-consumer').SourceMapConsumer;
+  var SourceMapGenerator = require('source-map/source-map-generator').SourceMapGenerator;
+
+  exports['test eating our own dog food'] = function (assert, util) {
+    var smg = new SourceMapGenerator({
+      file: 'testing.js',
+      sourceRoot: '/wu/tang'
+    });
+
+    smg.addMapping({
+      source: 'gza.coffee',
+      original: { line: 1, column: 0 },
+      generated: { line: 2, column: 2 }
+    });
+
+    smg.addMapping({
+      source: 'gza.coffee',
+      original: { line: 2, column: 0 },
+      generated: { line: 3, column: 2 }
+    });
+
+    smg.addMapping({
+      source: 'gza.coffee',
+      original: { line: 3, column: 0 },
+      generated: { line: 4, column: 2 }
+    });
+
+    smg.addMapping({
+      source: 'gza.coffee',
+      original: { line: 4, column: 0 },
+      generated: { line: 5, column: 2 }
+    });
+
+    var smc = new SourceMapConsumer(smg.toString());
+
+    // Exact
+    util.assertMapping(2, 2, '/wu/tang/gza.coffee', 1, 0, null, smc, assert);
+    util.assertMapping(3, 2, '/wu/tang/gza.coffee', 2, 0, null, smc, assert);
+    util.assertMapping(4, 2, '/wu/tang/gza.coffee', 3, 0, null, smc, assert);
+    util.assertMapping(5, 2, '/wu/tang/gza.coffee', 4, 0, null, smc, assert);
+
+    // Fuzzy
+
+    // Original to generated
+    util.assertMapping(2, 0, null, null, null, null, smc, assert, true);
+    util.assertMapping(2, 9, '/wu/tang/gza.coffee', 1, 0, null, smc, assert, true);
+    util.assertMapping(3, 0, '/wu/tang/gza.coffee', 1, 0, null, smc, assert, true);
+    util.assertMapping(3, 9, '/wu/tang/gza.coffee', 2, 0, null, smc, assert, true);
+    util.assertMapping(4, 0, '/wu/tang/gza.coffee', 2, 0, null, smc, assert, true);
+    util.assertMapping(4, 9, '/wu/tang/gza.coffee', 3, 0, null, smc, assert, true);
+    util.assertMapping(5, 0, '/wu/tang/gza.coffee', 3, 0, null, smc, assert, true);
+    util.assertMapping(5, 9, '/wu/tang/gza.coffee', 4, 0, null, smc, assert, true);
+
+    // Generated to original
+    util.assertMapping(2, 2, '/wu/tang/gza.coffee', 1, 1, null, smc, assert, null, true);
+    util.assertMapping(3, 2, '/wu/tang/gza.coffee', 2, 3, null, smc, assert, null, true);
+    util.assertMapping(4, 2, '/wu/tang/gza.coffee', 3, 6, null, smc, assert, null, true);
+    util.assertMapping(5, 2, '/wu/tang/gza.coffee', 4, 9, null, smc, assert, null, true);
+  };
+
+});
+function run_test() {
+  runSourceMapTests('test/source-map/test-dog-fooding', do_throw);
+}