diff options
Diffstat (limited to 'js/src/tests/non262/Array/for_of_3.js')
-rw-r--r-- | js/src/tests/non262/Array/for_of_3.js | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/for_of_3.js b/js/src/tests/non262/Array/for_of_3.js new file mode 100644 index 0000000000..c90eb1f000 --- /dev/null +++ b/js/src/tests/non262/Array/for_of_3.js @@ -0,0 +1,60 @@ +// Test corner cases of for-of iteration over Arrays. +// The current SetObject::construct method uses a ForOfIterator to extract +// values from the array, so we use that mechanism to test ForOfIterator here. + +// +// Check array length increases changes during iteration. +// +function TestIncreaseArrayLength() { + function doIter(f, arr) { + return f(...new Set(arr)); + } + + function fun(a, b, c) { + var result = 0; + for (var i = 0; i < arguments.length; i++) + result += arguments[i]; + return result; + } + + var GET_COUNT = 0; + function getter() { + GET_COUNT++; + if (GET_COUNT == MID) { + ARR_SUM += arr.length; + arr.push(arr.length); + } + return M2; + } + + var iter = ([])[Symbol.iterator](); + var iterProto = Object.getPrototypeOf(iter); + var OldNext = iterProto.next; + var NewNext = function () { + return OldNext.apply(this, arguments); + }; + + var TRUE_SUM = 0; + var N = 100; + var MID = N/2; + var M = 3; + var arr = new Array(M); + var ARR_SUM = 0; + for (var j = 0; j < M; j++) { + arr[j] = j; + ARR_SUM += j; + } + var M2 = (M/2)|0; + Object.defineProperty(arr, M2, {'get':getter}); + + var sum = 0; + for (var i = 0; i < N; i++) { + sum += doIter(fun, arr); + TRUE_SUM += ARR_SUM; + } + assertEq(sum, TRUE_SUM); +} +TestIncreaseArrayLength(); + +if (typeof reportCompare === "function") + reportCompare(true, true); |