1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/has-undefined-null.js b/js/src/jit-test/tests/cacheir/has-undefined-null.js
new file mode 100644
index 0000000000..7f0109a5c1
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/has-undefined-null.js
@@ -0,0 +1,28 @@
+function exists() {
+  var a = {'null': 0, 'undefined': 0};
+  for (var i = 0; i < 100; i++) {
+    assertEq(null in a, true);
+    assertEq(undefined in a, true);
+  }
+}
+
+function missing() {
+  var a = {};
+  for (var i = 0; i < 100; i++) {
+    assertEq(null in a, false);
+    assertEq(undefined in a, false);
+  }
+}
+
+function mixed() {
+  var x = [{'null': 0}, {'undefined': 0}]
+  for (var i = 0; i < 100; i++) {
+    var a = x[i % 2];
+    assertEq(null in a, i % 2 == 0);
+    assertEq(undefined in a, i % 2 == 1);
+  }
+}
+
+exists();
+missing();
+mixed();