量角器/ Jasmine未定义的变量问题

Question

为什么在下面的代码中变量username1未定义？ username是有效的howeverand返回预期值：

var AngularHomePage = function() {
  this.nameInput = element(by.model('yourName'));
  this.greeting = element(by.binding('yourName'));

  this.get = function() {
    browser.get('http://www.angularjs.org');
  };

  this.setName = function() {
    var username;
    var reader = csv.createCsvFileReader('../spece2e/sneh.csv', {
      'columnsFromHeader': false,
      'separator': ','
    });
    reader.addListener('data', function(data) {
      username = data[0];
      console.log('data from csv is: ',username);
      //return username;                
    });
    return username;    
  };

  var username1=this.setName();
  console.log('data being sent: ',username1);
  this.nameInput.sendKeys(username1);
};

module.exports=new AngularHomePage();