michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: function f(arr)
michael@0: {
michael@0:   assertEq(arr.splice(1, 2, 9, 8, 7, 6).length, 2); // if it doesn't throw :-)
michael@0: }
michael@0: 
michael@0: var N = 100;
michael@0: 
michael@0: function test(out)
michael@0: {
michael@0:   // Create an array of arrays, to be iterated over for [].splice-calling.
michael@0:   var arrs = out.arrs = [];
michael@0:   for (var i = 0; i < N; i++)
michael@0:     arrs.push([0, 1, 2, 3]);
michael@0: 
michael@0:   // Use a much-greater capacity than the eventual non-writable length, just for
michael@0:   // variability.
michael@0:   var a = [0, 1, 2, 3, 4, 5, 6, 7];
michael@0:   Object.defineProperty(a, "length", { writable: false, value: 4 });
michael@0: 
michael@0:   arrs.push(a);
michael@0: 
michael@0:   for (var i = 0, sz = arrs.length; i < sz; i++)
michael@0:     f(arrs[i]);
michael@0: }
michael@0: 
michael@0: var obj = {};
michael@0: assertThrowsInstanceOf(function() { test(obj); }, TypeError);
michael@0: 
michael@0: var arrs = obj.arrs;
michael@0: assertEq(arrs.length, N + 1);
michael@0: for (var i = 0; i < N; i++)
michael@0: {
michael@0:   assertEq(arrs[i].length, 6, "unexpected length for arrs[" + i + "]");
michael@0:   assertEq(arrs[i][0], 0,  "bad element for arrs[" + i + "][0]");
michael@0:   assertEq(arrs[i][1], 9, "bad element for arrs[" + i + "][1]");
michael@0:   assertEq(arrs[i][2], 8, "bad element for arrs[" + i + "][2]");
michael@0:   assertEq(arrs[i][3], 7, "bad element for arrs[" + i + "][3]");
michael@0:   assertEq(arrs[i][4], 6, "bad element for arrs[" + i + "][4]");
michael@0:   assertEq(arrs[i][5], 3, "bad element for arrs[" + i + "][5]");
michael@0: }
michael@0: 
michael@0: var a = arrs[N];
michael@0: assertEq(a[0], 0, "bad element for a[0]");
michael@0: assertEq(a[1], 1, "bad element for a[1]");
michael@0: assertEq(a[2], 2, "bad element for a[2]");
michael@0: assertEq(a[3], 3, "bad element for a[3]");
michael@0: assertEq(a.hasOwnProperty(4), false, "shouldn't have added any elements");
michael@0: assertEq(a[4], undefined);
michael@0: assertEq(a.hasOwnProperty(5), false, "shouldn't have added any elements");
michael@0: assertEq(a[5], undefined);
michael@0: assertEq(a.length, 4, "length shouldn't have been changed");