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-rw-r--r--modules/libpref/test/unit/test_bug577950.js17
1 files changed, 17 insertions, 0 deletions
diff --git a/modules/libpref/test/unit/test_bug577950.js b/modules/libpref/test/unit/test_bug577950.js
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index 0000000000..f9106a349f
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+++ b/modules/libpref/test/unit/test_bug577950.js
@@ -0,0 +1,17 @@
+/* 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() {
+ var observer = {
+ QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+
+ observe: function observe(aSubject, aTopic, aState) {
+ // Don't do anything.
+ },
+ };
+
+ /* Set the same pref twice. This shouldn't leak. */
+ Services.prefs.addObserver("UserPref.nonexistent.setIntPref", observer);
+ Services.prefs.addObserver("UserPref.nonexistent.setIntPref", observer);
+}