--- /dev/null
+'use strict';
+
+var iteratorSymbol = require('es6-symbol').iterator
+ , Iterator = require('../');
+
+module.exports = function (t, a) {
+ var iterator;
+ a.throws(function () { t(); }, TypeError, "Null");
+ a.throws(function () { t({}); }, TypeError, "Plain object");
+ a.throws(function () { t({ length: 0 }); }, TypeError, "Array-like");
+ iterator = {};
+ iterator[iteratorSymbol] = function () { return new Iterator([]); };
+ a(t(iterator) instanceof Iterator, true, "Iterator");
+ a(String(t([])), '[object Array Iterator]', " Array");
+ a(String(t((function () { return arguments; }()))), '[object Array Iterator]', " Arguments");
+ a(String(t('foo')), '[object String Iterator]', "String");
+};