--- /dev/null
+'use strict';
+
+var isValidFormat = RegExp.prototype.test.bind(/^[a-z0-9]+$/);
+
+module.exports = function (t, a) {
+ a(typeof t(), 'string');
+ a.ok(t().length > 7);
+ a.not(t(), t());
+ a.ok(isValidFormat(t()));
+ a.ok(isValidFormat(t()));
+ a.ok(isValidFormat(t()));
+ a.ok(isValidFormat(t()));
+ a.ok(isValidFormat(t()));
+};