1 files changed, 10 insertions, 0 deletions
diff --git a/comm/calendar/test/unit/test_duration.js b/comm/calendar/test/unit/test_duration.js
new file mode 100644
index 0000000000..cef7bbddf9
--- /dev/null
+++ b/comm/calendar/test/unit/test_duration.js
@@ -0,0 +1,10 @@
+/* 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/. */
+
+function run_test() {
+  let a = cal.createDuration("PT1S");
+  let b = cal.createDuration("PT3S");
+  a.addDuration(b);
+  equal(a.icalString, "PT4S");
+}