1 files changed, 85 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/mochitest/test_ext_tabs_detectLanguage.html b/toolkit/components/extensions/test/mochitest/test_ext_tabs_detectLanguage.html
new file mode 100644
index 0000000000..ad41545429
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+++ b/toolkit/components/extensions/test/mochitest/test_ext_tabs_detectLanguage.html
@@ -0,0 +1,85 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Verify detectLangauge</title>
+  <meta charset="utf-8">
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+
+add_task(async function testDetectLanguage() {
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["tabs"],
+      host_permissions: ["<all_urls>"],
+      granted_host_permissions: true
+    },
+
+    background: async function() {
+      const BASE_PATH = "tests/toolkit/components/extensions/test/mochitest";
+
+      function loadTab(url) {
+        return browser.tabs.create({ url });
+      }
+
+      try {
+        let tab = await loadTab(
+          `https://example.com/${BASE_PATH}/file_language_ja.html`
+        );
+        let lang = await browser.tabs.detectLanguage(tab.id);
+        browser.test.assertEq(
+          "ja",
+          lang,
+          "Japanese document should be detected as Japanese"
+        );
+        await browser.tabs.remove(tab.id);
+
+        tab = await loadTab(
+          `https://example.com/${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(
+          `https://example.com/${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();
+});
+
+
+</script>
+
+</body>
+</html>