1 files changed, 40 insertions, 0 deletions
diff --git a/browser/components/preferences/tests/browser_fluent.js b/browser/components/preferences/tests/browser_fluent.js
new file mode 100644
index 0000000000..4e3216549b
--- /dev/null
+++ b/browser/components/preferences/tests/browser_fluent.js
@@ -0,0 +1,40 @@
+function whenMainPaneLoadedFinished() {
+  return new Promise(function(resolve, reject) {
+    const topic = "main-pane-loaded";
+    Services.obs.addObserver(function observer(aSubject) {
+      Services.obs.removeObserver(observer, topic);
+      resolve();
+    }, topic);
+  });
+}
+
+// Temporary test for an experimental new localization API.
+// See bug 1402069 for details.
+add_task(async function() {
+  // The string is used only when `browserTabsRemoteAutostart` is true
+  if (!Services.appinfo.browserTabsRemoteAutostart) {
+    ok(true, "fake test to avoid harness complaining");
+    return;
+  }
+
+  await Promise.all([
+    openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true }),
+    whenMainPaneLoadedFinished(),
+  ]);
+
+  let doc = gBrowser.contentDocument;
+  await doc.l10n.ready;
+
+  let [msg] = await doc.l10n.formatMessages([{ id: "category-general" }]);
+
+  let elem = doc.querySelector(`#category-general`);
+
+  Assert.deepEqual(msg, {
+    value: null,
+    attributes: [
+      { name: "tooltiptext", value: elem.getAttribute("tooltiptext") },
+    ],
+  });
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});