1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/S15.4.4.4_A3_T3.js b/js/src/tests/test262/built-ins/Array/prototype/concat/S15.4.4.4_A3_T3.js
new file mode 100644
index 0000000000..270a2a0137
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/concat/S15.4.4.4_A3_T3.js
@@ -0,0 +1,37 @@
+// Copyright (c) 2014 Ecma International.  All rights reserved.
+// See LICENSE or https://github.com/tc39/test262/blob/HEAD/LICENSE
+
+/*---
+esid: sec-array.prototype.concat
+info: Array.prototype.concat uses [[Get]] on 'length' to determine array length
+es5id: 15.4.4.4_A3_T3
+description: >
+  checking whether non-ownProperties are seen, copied by Array.prototype.concat: Object.prototype[1]
+---*/
+
+var a = [0];
+
+assert.sameValue(a.length, 1, 'The value of a.length is expected to be 1');
+
+a.length = 3;
+
+assert.sameValue(a[1], undefined, 'The value of a[1] is expected to equal undefined');
+assert.sameValue(a[2], undefined, 'The value of a[2] is expected to equal undefined');
+
+Object.prototype[2] = 2;
+
+assert.sameValue(a[1], undefined, 'The value of a[1] is expected to equal undefined');
+assert.sameValue(a[2], 2, 'The value of a[2] is expected to be 2');
+assert.sameValue(a.hasOwnProperty('1'), false, 'a.hasOwnProperty("1") must return false');
+assert.sameValue(a.hasOwnProperty('2'), false, 'a.hasOwnProperty("2") must return false');
+
+var b = a.concat();
+
+assert.sameValue(b.length, 3, 'The value of b.length is expected to be 3');
+assert.sameValue(b[0], 0, 'The value of b[0] is expected to be 0');
+assert.sameValue(b[1], undefined, 'The value of b[1] is expected to equal undefined');
+assert.sameValue(b[2], 2, 'The value of b[2] is expected to be 2');
+assert.sameValue(b.hasOwnProperty('1'), false, 'b.hasOwnProperty("1") must return false');
+assert.sameValue(b.hasOwnProperty('2'), true, 'b.hasOwnProperty("2") must return true');
+
+reportCompare(0, 0);