如何在 rspec 中测试放置 [英] How to test puts in rspec

问题描述

我想做的是在命令行上运行ruby sayhello.rb，然后从Rspec接收Hello.

I want to do is run ruby sayhello.rb on the command line, then receive Hello from Rspec.

我有这个:

class Hello
  def speak
    puts 'Hello from RSpec'
  end
end

hi = Hello.new #brings my object into existence
hi.speak

现在我想在 rspec 中编写一个测试来检查命令行输出实际上是Hello from RSpec"而不是我喜欢 Unix"

Now I want to write a test in rspec to check that the command line output is in fact "Hello from RSpec" and not "I like Unix"

不工作.我目前在 sayhello_spec.rb 文件中有这个

NOT WORKING. I currently have this in my sayhello_spec.rb file

require_relative 'sayhello.rb' #points to file so I can 'see' it

describe "sayhello.rb" do
  it "should say 'Hello from Rspec' when ran" do        
    STDOUT.should_receive(:puts).with('Hello from RSpec')    
  end
end

另外，我需要实际看看我的 RSPEC 中的测试应该是什么样子.

Also, I need to actually see what the test should look like in my RSPEC please.

推荐答案

我认为最好的方法是在输出匹配器中使用 rspec build https://www.relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/output-matcher

I think the best way is to use rspec build in output matcher https://www.relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/output-matcher

例如，这是你的课

class MakeIt
  def awesome(text)
    puts "Awesome #{text}"
  end
end

和你的测试

describe MakeIt do
  describe '#awesome' do
    it 'prints awesome things' do
      expect do
        MakeIt.new.awesome('tests')
      end.to output('Awesome tests').to_stdout
    end

    it 'does not print not awesome things' do
      expect do
        MakeIt.new.awesome('tests')
      end.to_not output('Not awesome tests').to_stdout
    end
  end
end

很好，干净，符合书本！

Nice, clean and by the book!

这篇关于如何在 rspec 中测试放置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！