casper filling and login test

casper.test.js

casper.test.begin('test 163 mail login', 2, function(test) {
    casper.start('http://mail.163.com/', function() {
        this.capture('step1.png');
        test.assertExists('#loginBtn');
        this.fill('form', {
          'username': 'xxx',
          'password': 'xxx'
        }, true);
        this.click('#loginBtn');
        this.capture('step2.png');

        var timeout = 3000;
        this.waitFor(function(){
          return this.getTitle().indexOf('网易邮箱') != -1;
        }, function() {
          this.echo('登录成功');
          this.capture('step3.png');
        }, function() {
          this.capture('timeout.png');
          this.die('超时');
        }, timeout);
    }).run(function() {
        test.done();
    });
});