An attempt to fix the tests.

test/mjsunit/array-splice.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 13 matching lines @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Check that splicing array of holes keeps it as array of holes
 (function() {
   for (var i = 0; i < 7; i++) {
     var array = new Array(10);
     var spliced = array.splice(1, 1, 'one', 'two');
     assertEquals(1, spliced.length);
-    assertFalse(0 in spliced, "0 in spliced");
+    assertFalse(0 in spliced, "0 in spliced: " + spliced);
 
     assertEquals(11, array.length);
-    assertFalse(0 in array, "0 in array");
+    assertFalse(0 in array, "0 in array: " + array);
     assertTrue(1 in array);
     assertTrue(2 in array);
-    assertFalse(3 in array, "3 in array");
+    assertFalse(3 in array, "3 in array: " + array);
   }
 })();
 
 
 // Check various variants of empty array's splicing.
 (function() {
   for (var i = 0; i < 7; i++) {
     assertEquals([], [].splice(0, 0));
     assertEquals([], [].splice(1, 0));
     assertEquals([], [].splice(0, 1));
@@ skipping 260 matching lines @@
 
 (function() {
   for (var i = 0; i < 7; i++) {
     var a = [7, 8, 9];
     a.splice(0, 0, 1, 2, 3, 4, 5, 6);
     assertEquals([1, 2, 3, 4, 5, 6, 7, 8, 9], a);
     assertFalse(a.hasOwnProperty(10), "a.hasOwnProperty(10)");
     assertEquals(undefined, a[10]);
   }
 })();