1 files changed, 17 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Object-preventExtensions-01.js b/js/src/jit-test/tests/debug/Object-preventExtensions-01.js
new file mode 100644
index 000000000..729a72262
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Object-preventExtensions-01.js
@@ -0,0 +1,17 @@
+// Basic preventExtensions test.
+
+var g = newGlobal();
+var obj = g.eval("({x: 1})");
+assertEq(g.Object.isExtensible(obj), true);
+
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+var objw = gw.makeDebuggeeValue(obj);
+assertEq(objw.isExtensible(), true);
+
+assertEq(objw.preventExtensions(), undefined);
+assertEq(g.Object.isExtensible(obj), false);
+assertEq(objw.isExtensible(), false);
+
+// Calling preventExtensions again has no effect.
+assertEq(objw.preventExtensions(), undefined);