1 files changed, 17 insertions, 0 deletions
diff --git a/uriloader/exthandler/tests/unit/test_getFromTypeAndExtension.js b/uriloader/exthandler/tests/unit/test_getFromTypeAndExtension.js
new file mode 100644
index 0000000000..6f4fe52a49
--- /dev/null
+++ b/uriloader/exthandler/tests/unit/test_getFromTypeAndExtension.js
@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_utf8_extension() {
+  const mimeService = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+  let someMIME = mimeService.getFromTypeAndExtension(
+    "application/x-nonsense",
+    ".тест"
+  );
+  Assert.stringContains(someMIME.description, "тест");
+  // primary extension isn't set on macOS or android, see bug 1721181
+  if (AppConstants.platform != "macosx" && AppConstants.platform != "android") {
+    Assert.equal(someMIME.primaryExtension, ".тест");
+  }
+});