1 files changed, 15 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_bug1021312.js b/js/xpconnect/tests/unit/test_bug1021312.js
new file mode 100644
index 0000000000..ccb9981b43
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_bug1021312.js
@@ -0,0 +1,15 @@
+/* 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 sb = new Cu.Sandbox(this);
+  var called = false;
+
+  Cu.exportFunction(function(str) { Assert.ok(/someString/.test(str)); called = true; },
+                    sb, { defineAs: "func" });
+  // Do something weird with the string to make sure that it doesn't get interned.
+  Cu.evalInSandbox("var str = 'someString'; for (var i = 0; i < 10; ++i) str += i;", sb);
+  Cu.evalInSandbox("func(str);", sb);
+  Assert.ok(called);
+}