michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: function f(arr, v1, v2)
michael@0: {
michael@0:   // Ensure array_push_slowly is called by passing more than one argument.
michael@0:   arr.push(v1, v2);
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 [].push-calling.  We
michael@0:   // can't just loop on push on a single array with non-writable length because
michael@0:   // push throws when called on an array with non-writable length.
michael@0:   var arrs = out.arrs = [];
michael@0:   for (var i = 0; i < N; i++)
michael@0:     arrs.push([]);
michael@0: 
michael@0:   // Use a much-greater capacity than the eventual non-writable length.
michael@0:   var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
michael@0:   Object.defineProperty(a, "length", { writable: false, value: 6 });
michael@0: 
michael@0:   arrs.push(a);
michael@0: 
michael@0:   for (var i = 0, sz = arrs.length; i < sz; i++)
michael@0:   {
michael@0:     var arr = arrs[i];
michael@0:     f(arr, 8675309, 3141592);
michael@0:   }
michael@0: }
michael@0: 
michael@0: var obj = {};
michael@0: 
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, 2, "unexpected length for arrs[" + i + "]");
michael@0:   assertEq(arrs[i][0], 8675309, "bad element for arrs[" + i + "][0]");
michael@0:   assertEq(arrs[i][1], 3141592, "bad element for arrs[" + i + "][1]");
michael@0: }
michael@0: 
michael@0: var a = arrs[N];
michael@0: assertEq(a.hasOwnProperty(6), false);
michael@0: assertEq(a[6], undefined);
michael@0: assertEq(a.hasOwnProperty(7), false);
michael@0: assertEq(a[7], undefined);
michael@0: assertEq(a.length, 6);