Retry: Rename all test files from JS -> ES6

test/javascripts/models/invite-test.js

@@ -0,0 +1,7 @@
+import Invite from "discourse/models/invite";
+
+QUnit.module("model:invite");
+
+QUnit.test("create", assert => {
+  assert.ok(Invite.create(), "it can be created without arguments");
+});