1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/shifted-elements5.js b/js/src/jit-test/tests/basic/shifted-elements5.js
new file mode 100644
index 0000000000..07e0bce5b5
--- /dev/null
+++ b/js/src/jit-test/tests/basic/shifted-elements5.js
@@ -0,0 +1,39 @@
+function testFreeze() {
+    var arr = [];
+    for (var i = 0; i < 20; i++)
+        arr.push(i);
+    for (var i = 0; i < 10; i++)
+        arr.shift();
+    Object.freeze(arr);
+    assertEq(arr.length, 10);
+    arr[0] = -1;
+    assertEq(arr[0], 10);
+}
+testFreeze();
+testFreeze();
+
+function testCopyOnWrite() {
+    var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+    for (var i = 0; i < 5; i++)
+        assertEq(arr.shift(), i + 1);
+    assertEq(arr.toString(), "6,7,8,9");
+}
+testCopyOnWrite();
+testCopyOnWrite();
+
+function testNonWritableLength() {
+    var arr = [];
+    for (var i = 0; i < 20; i++)
+        arr.push(i);
+    Object.defineProperty(arr, "length", {writable: false, value: arr.length});
+    var ex;
+    try {
+        arr.shift();
+    } catch(e) {
+        ex = e;
+    }
+    assertEq(ex instanceof TypeError, true);
+    assertEq(arr.length, 20);
+}
+testNonWritableLength();
+testNonWritableLength();