1 files changed, 20 insertions, 0 deletions
diff --git a/comm/calendar/test/unit/test_bug653924.js b/comm/calendar/test/unit/test_bug653924.js
new file mode 100644
index 0000000000..1573ae54aa
--- /dev/null
+++ b/comm/calendar/test/unit/test_bug653924.js
@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+var { XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs");
+
+XPCOMUtils.defineLazyModuleGetters(this, {
+  CalEvent: "resource:///modules/CalEvent.jsm",
+  CalRelation: "resource:///modules/CalRelation.jsm",
+});
+
+function run_test() {
+  const evt = new CalEvent();
+  const rel = new CalRelation("RELATED-TO:2424d594-0453-49a1-b842-6faee483ca79");
+  evt.addRelation(rel);
+
+  equal(1, evt.icalString.match(/RELATED-TO/g).length);
+  evt.icalString = evt.icalString; // eslint-disable-line no-self-assign
+  equal(1, evt.icalString.match(/RELATED-TO/g).length);
+}