我如何测试一个包含 gets.chomp 的函数? [英] How do I test a function with gets.chomp in it?

问题描述

我有一个使用gets.chomp的简单函数，如下所示:

I have a simple function using gets.chomp like this:

def welcome_user
   puts "Welcome! What would you like to do?"
   action = gets.chomp
end 

我想使用 ruby 的内置 TestCase 套件来测试它，如下所示:

I'd like to test it using ruby's built in TestCase suite like this:

class ViewTest < Test::Unit::TestCase
   def test_welcome
      welcome_user      
   end 
end 

问题是，当我运行该测试时，gets.chomp 会停止测试，因为它需要用户输入一些内容.有没有办法只使用 ruby 来模拟用户输入?

The problem is, when I run that test, the gets.chomp stops the test because it needs the user to enter in something. Is there a way I can simulate user inputs using just ruby?

推荐答案

你先把方法的 2 个关注点分开:

You first separate the 2 concerns of the method:

def get_action
  gets.chomp
end

def welcome_user
  puts "Welcome to Jamaica and have a nice day!"
  action = get_action
  return "Required action was #{action}."
end

然后你单独测试第二个.

And then you test the second one separately.

require 'minitest/spec'
require 'minitest/autorun'

describe "Welcoming users" do
  before do
    def get_action; "test string" end
  end

  it "should work" do
    welcome_user.must_equal "Required action was test string."
  end
end

至于第一个，你可以

1. 手动测试它并确保它不会损坏(推荐方法，TDD 不是一种信仰).
2. 获取有问题的shell的被颠覆版本并使其模仿用户，并进行比较get_action 是否确实获取了用户输入的内容.

1. Test it by hand and rely that it won't break (recommended approach, TDD is not a religion).
2. Get the subverted version of the shell in question and make it imitate the user, and compare whether get_action indeed gets what the user types.

虽然这是对您的问题的实用答案，但我不知道该怎么做 2.，我只知道如何模仿浏览器后面的用户 (watir-webdriver) 而不是后面的外壳会话.

While this is a practical answer to your problem, I do not know how to do 2., I only know how to imitate the user behind the browser (watir-webdriver) and not behind the shell session.

这篇关于我如何测试一个包含 gets.chomp 的函数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！