1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/watchtower/megamorphic-has-prop.js b/js/src/jit-test/tests/watchtower/megamorphic-has-prop.js
new file mode 100644
index 0000000000..d827f1ec12
--- /dev/null
+++ b/js/src/jit-test/tests/watchtower/megamorphic-has-prop.js
@@ -0,0 +1,35 @@
+// |jit-test| --enable-watchtower
+
+function hasOwnProp(o, p) {
+    return Object.prototype.hasOwnProperty.call(o, p);
+}
+function testHasProp() {
+    var C = Object.create(null);
+    C.protox = 0;
+    var B = Object.create(C);
+    var objs = [];
+    for (var i = 0; i < 50; i++) {
+        var A = Object.create(B);
+        A["x" + i] = 0;
+        A.ownx = 3;
+        objs.push(A);
+    }
+    for (var i = 0; i < 10; i++) {
+        for (var j = 0; j < objs.length; j++) {
+            var obj = objs[j];
+            assertEq(hasOwnProp(obj, "protox"), false);
+            assertEq("protox" in obj, true);
+            assertEq(obj.protox, 0);
+
+            assertEq(hasOwnProp(obj, "ownx"), true);
+            assertEq("ownx" in obj, true);
+            assertEq(obj.ownx, 3);
+
+            assertEq("missing" in obj, false);
+            assertEq(hasOwnProp(obj, "missing"), false);
+            assertEq(obj.missing, undefined);
+        }
+    }
+}
+testHasProp();
+