var moment = require('moment');
var React = require('react');
var utils = require('./utils');
 
module.exports = React.createClass({
    days: function() {
        var days = [];
        var nextMonth = this.daysFromNextMonth(days,numberOfDays);
        return days;
    },daysFromNextMonth: function(days,numberOfDays) {
        ...
    },render: function() {
        var that = this;
        var days = this.days().map(function(day,i) {
            return <li key={day}>{day}</li>
        return (
            <ul className='monthly-view'>
                {days}
            </ul>
        );
    }
});

我想抓住我的日子或daysFromNextMonth函数,看看他们是否正在返回我期望的内容.我试着开玩笑地抓住这个函数：

it('should show an render',function() {
    var result = DailyView.daysFromNextMonth(day,10)
    ....
});

我的错误说我没有方法daysFromNextMonth.我该如何解决？