1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/sparse-and-dense-elements.js b/js/src/jit-test/tests/basic/sparse-and-dense-elements.js
new file mode 100644
index 0000000000..2c18c98f93
--- /dev/null
+++ b/js/src/jit-test/tests/basic/sparse-and-dense-elements.js
@@ -0,0 +1,20 @@
+function f(o) {
+    for (var i = 0; i < 40; i++) {
+        if ((i > 10 && (i % 2) === 0) || i > 30) {
+            Object.defineProperty(o, i, {value: i, enumerable: false,
+                                         writable: true, configurable: true});
+        } else {
+            o[i] = i;
+        }
+    }
+    for (var i = 0; i < 15; i++) {
+        var sum = 0;
+        for (var j = 0; j < 40; j++) {
+            o[j]++;
+            sum += o[j];
+        }
+        assertEq(sum, 820 + i * 40);
+    }
+}
+f({});
+f([]);