michael@0: function testArrayDensityChange() {
michael@0:   var x = [];
michael@0:   var count = 0;
michael@0:   for (var i=0; i < 100; ++i) {
michael@0:     x[i] = "asdf";
michael@0:   }
michael@0:   for (var i=0; i < x.length; ++i) {
michael@0:       if (i == 51)
michael@0:       {
michael@0:         x[199] = "asdf";
michael@0:       }
michael@0:       if (x[i])
michael@0:         count += x[i].length;
michael@0:   }
michael@0:   return count;
michael@0: }
michael@0: assertEq(testArrayDensityChange(), 404);