1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/dict-object-freeze-or-seal.js b/js/src/jit-test/tests/basic/dict-object-freeze-or-seal.js
new file mode 100644
index 0000000000..595e5ca55a
--- /dev/null
+++ b/js/src/jit-test/tests/basic/dict-object-freeze-or-seal.js
@@ -0,0 +1,26 @@
+let sym = Symbol();
+
+let o = {x: 1, y: 2, z: 3, a: 4, b: 5, 12345678: 6, [sym]: 7};
+for (let i = 0; i < 100; i++) {
+    o["foo" + i] = 1;
+}
+delete o.x;
+
+Object.seal(o);
+assertEq(Object.getOwnPropertyNames(o).length, 105);
+assertEq(Object.getOwnPropertySymbols(o).length, 1);
+
+assertEq(Object.isSealed(o), true);
+assertEq(Object.isFrozen(o), false);
+
+let desc = Object.getOwnPropertyDescriptor(o, "y");
+assertEq(desc.writable, true);
+assertEq(desc.configurable, false);
+
+Object.freeze(o);
+assertEq(Object.isSealed(o), true);
+assertEq(Object.isFrozen(o), true);
+
+desc = Object.getOwnPropertyDescriptor(o, "y");
+assertEq(desc.writable, false);
+assertEq(desc.configurable, false);