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diff --git a/tools/addon-sdk-1.12/test/addons/l10n/main.js b/tools/addon-sdk-1.12/test/addons/l10n/main.js
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+++ b/tools/addon-sdk-1.12/test/addons/l10n/main.js
@@ -0,0 +1,181 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const prefs = require("sdk/preferences/service");
+const { Loader } = require('sdk/test/loader');
+const { resolveURI } = require('toolkit/loader');
+const { rootURI } = require("@loader/options");
+
+const PREF_MATCH_OS_LOCALE  = "intl.locale.matchOS";
+const PREF_SELECTED_LOCALE  = "general.useragent.locale";
+
+function setLocale(locale) {
+  prefs.set(PREF_MATCH_OS_LOCALE, false);
+  prefs.set(PREF_SELECTED_LOCALE, locale);
+}
+
+function resetLocale() {
+  prefs.reset(PREF_MATCH_OS_LOCALE);
+  prefs.reset(PREF_SELECTED_LOCALE);
+}
+
+function definePseudo(loader, id, exports) {
+  let uri = resolveURI(id, loader.mapping);
+  loader.modules[uri] = { exports: exports };
+}
+
+function createTest(locale, testFunction) {
+  return function (assert, done) {
+    let loader = Loader(module);
+    // Change the locale before loading new l10n modules in order to load
+    // the right .json file
+    setLocale(locale);
+    // Initialize main l10n module in order to load new locale files
+    loader.require("sdk/l10n/loader").
+      load(rootURI).
+      then(function success(data) {
+             definePseudo(loader, '@l10n/data', data);
+             // Execute the given test function
+             try {
+               testFunction(assert, loader, function onDone() {
+                 loader.unload();
+                 resetLocale();
+                 done();
+               });
+             }
+             catch(e) {
+              console.exception(e);
+             }
+           },
+           function failure(error) {
+             assert.fail("Unable to load locales: " + error);
+           });
+  };
+}
+
+exports.testExactMatching = createTest("fr-FR", function(assert, loader, done) {
+  let _ = loader.require("sdk/l10n").get;
+  assert.equal(_("Not translated"), "Not translated",
+                   "Key not translated");
+  assert.equal(_("Translated"), "Oui",
+                   "Simple key translated");
+
+  // Placeholders
+  assert.equal(_("placeholderString", "works"), "Placeholder works",
+                   "Value with placeholder");
+  assert.equal(_("Placeholder %s", "works"), "Placeholder works",
+                   "Key without value but with placeholder");
+  assert.equal(_("Placeholders %2s %1s %s.", "working", "are", "correctly"), 
+                   "Placeholders are working correctly.",
+                   "Multiple placeholders");
+
+  // Plurals
+   assert.equal(_("downloadsCount", 0),
+                   "0 téléchargement",
+                   "PluralForm form 'one' for 0 in french");
+  assert.equal(_("downloadsCount", 1),
+                   "1 téléchargement",
+                   "PluralForm form 'one' for 1 in french");
+  assert.equal(_("downloadsCount", 2),
+                   "2 téléchargements",
+                   "PluralForm form 'other' for n > 1 in french");
+
+  done();
+});
+
+exports.testHtmlLocalization = createTest("en-GB", function(assert, loader, done) {
+
+  // Ensure initing html component that watch document creations
+  // Note that this module is automatically initialized in
+  // cuddlefish.js:Loader.main in regular addons. But it isn't for unit tests.
+  let loaderHtmlL10n = loader.require("sdk/l10n/html");
+  loaderHtmlL10n.enable();
+
+  let uri = require("sdk/self").data.url("test-localization.html");
+  let worker = loader.require("sdk/page-worker").Page({
+    contentURL: uri,
+    contentScript: "new " + function ContentScriptScope() {
+      let nodes = document.body.querySelectorAll("*[data-l10n-id]");
+      self.postMessage([nodes[0].innerHTML,
+                        nodes[1].innerHTML,
+                        nodes[2].innerHTML,
+                        nodes[3].innerHTML]);
+    },
+    onMessage: function (data) {
+      assert.equal(
+        data[0],
+        "Kept as-is",
+        "Nodes with unknown id in .properties are kept 'as-is'"
+      );
+      assert.equal(data[1], "Yes", "HTML is translated");
+      assert.equal(
+        data[2],
+        "no <b>HTML</b> injection",
+        "Content from .properties is text content; HTML can't be injected."
+      );
+      assert.equal(data[3], "Yes", "Multiple elements with same data-l10n-id are accepted.");
+
+      done();
+    }
+  });
+
+});
+
+exports.testEnUsLocaleName = createTest("en-US", function(assert, loader, done) {
+  let _ = loader.require("sdk/l10n").get;
+
+  assert.equal(_("Not translated"), "Not translated",
+               "String w/o translation is kept as-is");
+  assert.equal(_("Translated"), "Yes",
+               "String with translation is correctly translated");
+
+  // Check plural forms regular matching
+  assert.equal(_("downloadsCount", 0),
+                   "0 downloads",
+                   "PluralForm form 'other' for 0 in english");
+  assert.equal(_("downloadsCount", 1),
+                   "one download",
+                   "PluralForm form 'one' for 1 in english");
+  assert.equal(_("downloadsCount", 2),
+                   "2 downloads",
+                   "PluralForm form 'other' for n != 1 in english");
+
+  // Check optional plural forms
+  assert.equal(_("pluralTest", 0),
+                   "optional zero form",
+                   "PluralForm form 'zero' can be optionaly specified. (Isn't mandatory in english)");
+  assert.equal(_("pluralTest", 1),
+                   "fallback to other",
+                   "If the specific plural form is missing, we fallback to 'other'");
+
+  // Ensure that we can omit specifying the generic key without [other]
+  // key[one] = ...
+  // key[other] = ...  # Instead of `key = ...`
+  assert.equal(_("explicitPlural", 1),
+                   "one",
+                   "PluralForm form can be omitting generic key [i.e. without ...[other] at end of key)");
+  assert.equal(_("explicitPlural", 10),
+                   "other",
+                   "PluralForm form can be omitting generic key [i.e. without ...[other] at end of key)");
+
+  done();
+});
+
+exports.testShortLocaleName = createTest("eo", function(assert, loader, done) {
+  let _ = loader.require("sdk/l10n").get;
+  assert.equal(_("Not translated"), "Not translated",
+               "String w/o translation is kept as-is");
+  assert.equal(_("Translated"), "jes",
+               "String with translation is correctly translated");
+
+  done();
+});
+
+
+// Before running tests, disable HTML service which is automatially enabled
+// in api-utils/addon/runner.js
+require('sdk/l10n/html').disable();
+
+require("sdk/test/runner").runTestsFromModule(module);