push-slowly-nonwritable-length.js (624B)
1 load(libdir + "asserts.js"); 2 3 function f(arr, v1, v2) 4 { 5 // Ensure array_push_slowly is called by passing more than one argument. 6 arr.push(v1, v2); 7 } 8 9 function basic() 10 { 11 // Use a much-greater capacity than the eventual non-writable length. 12 var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; 13 Object.defineProperty(a, "length", { writable: false, value: 6 }); 14 15 assertThrowsInstanceOf(() => f(a, 8675309, 3141592), TypeError); 16 17 assertEq(a.hasOwnProperty(6), false); 18 assertEq(a[6], undefined); 19 assertEq(a.hasOwnProperty(7), false); 20 assertEq(a[7], undefined); 21 assertEq(a.length, 6); 22 } 23 24 basic();