1 files changed, 29 insertions, 0 deletions
diff --git a/intl/locale/tests/unit/test_intl_on_workers.js b/intl/locale/tests/unit/test_intl_on_workers.js
new file mode 100644
index 0000000000..b5e05c4678
--- /dev/null
+++ b/intl/locale/tests/unit/test_intl_on_workers.js
@@ -0,0 +1,29 @@
+function run_test() {
+  do_load_manifest("data/chrome.manifest");
+
+  if (typeof Intl !== "object") {
+    dump("Intl not enabled, skipping test\n");
+    equal(true, true);
+    return;
+  }
+
+  let mainThreadLocale = Intl.NumberFormat().resolvedOptions().locale;
+  let testWorker = new Worker(
+    "chrome://locale/content/intl_on_workers_worker.js"
+  );
+  testWorker.onmessage = function (e) {
+    try {
+      let workerLocale = e.data;
+      equal(
+        mainThreadLocale,
+        workerLocale,
+        "Worker should inherit Intl locale from main thread."
+      );
+    } finally {
+      do_test_finished();
+    }
+  };
+
+  do_test_pending();
+  testWorker.postMessage("go!");
+}