1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/packed-arrays.js b/js/src/jit-test/tests/basic/packed-arrays.js
new file mode 100644
index 0000000000..a6814d47aa
--- /dev/null
+++ b/js/src/jit-test/tests/basic/packed-arrays.js
@@ -0,0 +1,51 @@
+var isPacked = getSelfHostedValue("IsPackedArray");
+
+function test() {
+    var arr;
+
+    // basic
+    arr = [];
+    assertEq(isPacked(arr), true);
+    arr[0] = 0;
+    assertEq(isPacked(arr), true);
+    arr[2] = 2;
+    assertEq(isPacked(arr), false);
+
+    // delete
+    arr = [1, 2, 3];
+    assertEq(isPacked(arr), true);
+    delete arr[1];
+    assertEq(isPacked(arr), false);
+
+    // setting .length
+    arr = [1];
+    arr.length = 0;
+    assertEq(isPacked(arr), true);
+    arr.length = 1;
+    assertEq(isPacked(arr), false);
+
+    // slice
+    arr = [1, 2, , 3];
+    assertEq(isPacked(arr), false);
+    assertEq(isPacked(arr.slice(0, 2)), true);
+    assertEq(isPacked(arr.slice(0, 3)), false);
+    assertEq(isPacked(arr.slice(2, 3)), false);
+    assertEq(isPacked(arr.slice(3, 4)), true);
+
+    // splice
+    arr = [1, 2, 3];
+    assertEq(isPacked(arr.splice(0)), true);
+    arr = [1, , 2];
+    assertEq(isPacked(arr.splice(0)), false);
+    arr = [1, , 2];
+    assertEq(isPacked(arr.splice(0, 1)), true);
+    assertEq(arr.length, 2);
+    assertEq(isPacked(arr.splice(0, 1)), false);
+    assertEq(arr.length, 1);
+    assertEq(isPacked(arr.splice(0, 1)), true);
+    assertEq(arr.length, 0);
+    assertEq(isPacked(arr.splice(0)), true);
+}
+for (var i = 0; i < 5; i++) {
+    test();
+}