Migrated several tests from blink to V8 repository.

test/webkit/sparse-array.js

Index: test/webkit/sparse-array.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/sparse-array.js
similarity index 69%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/sparse-array.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..f471a3a2d51e9fa4c127151a17c8a8918abde66d 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/sparse-array.js
@@ -22,10 +22,29 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
+'This tests some sparse array operations.'
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+var array = [ ];
 
+array[50000] = 100;
 
+shouldBe('array[0]', 'undefined');
+shouldBe('array[49999]', 'undefined');
+shouldBe('array[50000]', '100');
+shouldBe('array[50001]', 'undefined');
+array[0]++;
+shouldBe('array[0]', 'NaN');
+shouldBe('array[49999]', 'undefined');
+shouldBe('array[50000]', '100');
+shouldBe('array[50001]', 'undefined');
+// This tests oscillation between being sparse and dense.
+delete array[50000];
+array.length = 5;
+array[50000] = 100;
+shouldBe('array[0]', 'NaN');
+shouldBe('array[49999]', 'undefined');
+shouldBe('array[50000]', '100');
+shouldBe('array[50001]', 'undefined');
+
+debug('');