JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / tests / stress / arguments-iterator.js

diff --git a/tests/stress/arguments-iterator.js b/tests/stress/arguments-iterator.js
new file mode 100644 (file)
index 0000000..1980532
--- /dev/null
+++ b/tests/stress/arguments-iterator.js
@@ -0,0 +1,70 @@
+function test(actual, expected) {
+    if (actual !== expected)
+        throw new Error('bad value: ' + actual);
+}
+
+function testArguments(check) {
+    (function () {
+        check(arguments, []);
+    }());
+
+    (function (a, b, c) {
+        check(arguments, [a, b, c]);
+    }());
+
+    (function () {
+        'use strict';
+        check(arguments, []);
+    }());
+
+    (function (a, b, c) {
+        'use strict';
+        check(arguments, [a, b, c]);
+    }());
+}
+
+testArguments(function (args) {
+    var iteratorMethod = args[Symbol.iterator];
+    test(iteratorMethod, Array.prototype.values);
+    var descriptor = Object.getOwnPropertyDescriptor(args, Symbol.iterator);
+    test(descriptor.writable, true);
+    test(descriptor.configurable, true);
+    test(descriptor.enumerable, false);
+    test(descriptor.value, iteratorMethod);
+});
+
+testArguments(function (args, expected) {
+    var iterator = args[Symbol.iterator]();
+    test(iterator.toString(), '[object Array Iterator]');
+    var index = 0;
+    for (var value of iterator) {
+        test(value, expected[index++]);
+    }
+    test(args.length, index);
+
+    var index = 0;
+    for (var value of args) {
+        test(value, expected[index++]);
+    }
+    test(args.length, index);
+});
+
+testArguments(function (args) {
+    var symbols = Object.getOwnPropertySymbols(args);
+    test(symbols.length, 1);
+    test(symbols[0], Symbol.iterator);
+});
+
+testArguments(function (args) {
+    'use strict';
+    args[Symbol.iterator] = 'not throw error';
+});
+
+testArguments(function (args) {
+    'use strict';
+    delete args[Symbol.iterator];
+    test(args[Symbol.iterator], undefined);
+
+    var symbols = Object.getOwnPropertySymbols(args);
+    test(symbols.length, 0);
+});