1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/freeze-builtins.js b/js/src/jit-test/tests/basic/freeze-builtins.js
new file mode 100644
index 0000000000..7f59c4b203
--- /dev/null
+++ b/js/src/jit-test/tests/basic/freeze-builtins.js
@@ -0,0 +1,21 @@
+var g = newGlobal({freezeBuiltins: true});
+
+g.evaluate("" + function checkFrozen(name) {
+  // Check constructor on the global is non-writable/non-configurable.
+  let desc = Object.getOwnPropertyDescriptor(this, name);
+  assertEq(desc.writable, false);
+  assertEq(desc.configurable, false);
+
+  // Constructor must be frozen.
+  let ctor = desc.value;
+  assertEq(Object.isFrozen(ctor), true);
+
+  // Prototype must be sealed.
+  if (ctor.prototype) {
+    assertEq(Object.isSealed(ctor.prototype), true);
+  }
+});
+
+g.checkFrozen("Object");
+g.checkFrozen("Array");
+g.checkFrozen("Function");