1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/shifted-elements7.js b/js/src/jit-test/tests/basic/shifted-elements7.js
new file mode 100644
index 0000000000..3adcb61be8
--- /dev/null
+++ b/js/src/jit-test/tests/basic/shifted-elements7.js
@@ -0,0 +1,47 @@
+function test1() {
+    var a = [];
+    for (var i = 0; i < 100; i++)
+        a.unshift("foo" + i);
+    for (var i = 99; i >= 0; i--) {
+        assertEq(a.shift(), "foo" + i);
+        a.unshift("foo" + (i - 1));
+    }
+    assertEq(a.length, 100);
+}
+test1();
+
+function sum(arr) {
+    var res = 0;
+    for (var i = 0; i < arr.length; i++)
+        res += arr[i];
+    return res;
+}
+function test2() {
+    var a = [];
+    for (var i = 0; i < 200; i++)
+        a.push(i);
+    for (var i = 0; i < 100; i++)
+        a.shift();
+    for (var i = 0; i < 200; i++)
+        a.unshift(i);
+    assertEq(a.length, 300);
+    assertEq(sum(a), 34850);
+}
+test2();
+
+function test3() {
+    var a = [];
+    for (var i = 0; i < 200; i++)
+        a.push(i);
+    var toAdd = [];
+    var step = 1;
+    for (var i = 0; i < 2500; i += step) {
+        for (var j = 0; j < step; j++)
+            toAdd.unshift(i + j);
+        a.unshift(...toAdd);
+        step = Math.max((i / 16)|0, 1);
+    }
+    assertEq(a.length, 41463);
+    assertEq(sum(a), 26657756);
+}
+test3();