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: function basic()
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:   assertThrowsInstanceOf(() => f(a, 8675309, 3141592), TypeError);
michael@0: 
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);
michael@0: }
michael@0: 
michael@0: basic();