1 files changed, 52 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/iterator-cache-invalidation.js b/js/src/jit-test/tests/basic/iterator-cache-invalidation.js
new file mode 100644
index 0000000000..33adc5a16a
--- /dev/null
+++ b/js/src/jit-test/tests/basic/iterator-cache-invalidation.js
@@ -0,0 +1,52 @@
+function test(obj, expected) {
+  var result = "";
+  for (var s in obj) {
+    result += s + ",";
+  }
+  assertEq(result, expected);
+}
+
+function runTest(mutate, expectedAfter) {
+  var p = {px: 1, py: 2};
+  var o = Object.create(p);
+  o.x = 3;
+  o.y = 4;
+
+  var expectedBefore = "x,y,px,py,";
+  test(o, expectedBefore);
+  mutate(o, p);
+  test(o, expectedAfter);
+}
+
+
+function testAddElement() {
+  runTest((o,p) => { o[0] = 5; }, "0,x,y,px,py,");
+}
+function testAddProtoElement() {
+  runTest((o,p) => { p[0] = 5; }, "x,y,0,px,py,");
+}
+function testDelete() {
+  runTest((o,p) => { delete o.x; }, "y,px,py,");
+}
+function testProtoDelete() {
+  runTest((o,p) => { delete p.px; }, "x,y,py,");
+}
+function testMakeUnenumerable() {
+  runTest((o,p) => {
+    Object.defineProperty(o, "x", { value: 1, enumerable: false });
+  }, "y,px,py,");
+}
+function testMakeProtoUnenumerable() {
+  runTest((o,p) => {
+    Object.defineProperty(p, "px", { value: 1, enumerable: false });
+  }, "x,y,py,");
+}
+
+for (var i = 0; i < 10; i++) {
+  testAddElement();
+  testAddProtoElement();
+  testDelete();
+  testProtoDelete();
+  testMakeUnenumerable()
+  testMakeProtoUnenumerable()
+}