1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arrays/push-densely-nonwritable-length.js b/js/src/jit-test/tests/arrays/push-densely-nonwritable-length.js
new file mode 100644
index 0000000000..9c26661cb7
--- /dev/null
+++ b/js/src/jit-test/tests/arrays/push-densely-nonwritable-length.js
@@ -0,0 +1,31 @@
+function f(arr, v)
+{
+  arr.push(v);
+}
+
+function basic(out)
+{
+  // Use a much-greater capacity than the eventual non-writable length.
+  var a = out.a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
+  Object.defineProperty(a, "length", { writable: false, value: 6 });
+
+  f(a, 99);
+}
+
+var obj = {};
+var a;
+
+try
+{
+  basic(obj);
+  throw new Error("didn't throw!");
+}
+catch (e)
+{
+  assertEq(e instanceof TypeError, true, "expected TypeError, got " + e);
+
+  a = obj.a;
+  assertEq(a.hasOwnProperty(6), false);
+  assertEq(a[6], undefined);
+  assertEq(a.length, 6);
+}