1 files changed, 25 insertions, 0 deletions
diff --git a/modules/libpref/test/unit/test_bug506224.js b/modules/libpref/test/unit/test_bug506224.js
new file mode 100644
index 0000000000..033c5acc6e
--- /dev/null
+++ b/modules/libpref/test/unit/test_bug506224.js
@@ -0,0 +1,25 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/  */
+
+function run_test() {
+  const PREF_NAME = "testPref";
+
+  var prefs = Services.prefs.getDefaultBranch(null);
+  var userprefs = Services.prefs.getBranch(null);
+
+  prefs.setCharPref(PREF_NAME, "test0");
+  prefs.lockPref(PREF_NAME);
+  Assert.equal("test0", userprefs.getCharPref(PREF_NAME));
+  Assert.equal(false, userprefs.prefHasUserValue(PREF_NAME));
+
+  var file = do_get_profile();
+  file.append("prefs.js");
+  Services.prefs.savePrefFile(file);
+
+  prefs.unlockPref(PREF_NAME);
+  prefs.setCharPref(PREF_NAME, "test1");
+  Services.prefs.readUserPrefsFromFile(file);
+
+  Assert.equal("test1", userprefs.getCharPref(PREF_NAME));
+  Assert.equal(false, userprefs.prefHasUserValue(PREF_NAME));
+}