1 files changed, 65 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_tabs_detectLanguage.js b/browser/components/extensions/test/browser/browser_ext_tabs_detectLanguage.js
new file mode 100644
index 0000000000..2fbfad9d43
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_tabs_detectLanguage.js
@@ -0,0 +1,65 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+add_task(async function testDetectLanguage() {
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["tabs"],
+    },
+
+    background: async function () {
+      const BASE_PATH = "browser/browser/components/extensions/test/browser";
+
+      function loadTab(url) {
+        return browser.tabs.create({ url });
+      }
+
+      try {
+        let tab = await loadTab(
+          `http://example.co.jp/${BASE_PATH}/file_language_ja.html`
+        );
+        let lang = await browser.tabs.detectLanguage(tab.id);
+        browser.test.assertEq(
+          "ja",
+          lang,
+          "Japanese document should be detected as Japanese"
+        );
+        await browser.tabs.remove(tab.id);
+
+        tab = await loadTab(
+          `http://example.co.jp/${BASE_PATH}/file_language_fr_en.html`
+        );
+        lang = await browser.tabs.detectLanguage(tab.id);
+        browser.test.assertEq(
+          "fr",
+          lang,
+          "French/English document should be detected as primarily French"
+        );
+        await browser.tabs.remove(tab.id);
+
+        tab = await loadTab(
+          `http://example.co.jp/${BASE_PATH}/file_language_tlh.html`
+        );
+        lang = await browser.tabs.detectLanguage(tab.id);
+        browser.test.assertEq(
+          "und",
+          lang,
+          "Klingon document should not be detected, should return 'und'"
+        );
+        await browser.tabs.remove(tab.id);
+
+        browser.test.notifyPass("detectLanguage");
+      } catch (e) {
+        browser.test.fail(`Error: ${e} :: ${e.stack}`);
+        browser.test.notifyFail("detectLanguage");
+      }
+    },
+  });
+
+  await extension.startup();
+
+  await extension.awaitFinish("detectLanguage");
+
+  await extension.unload();
+});