Ruby minitest assert_output语法 [英] Ruby minitest assert_output syntax

问题描述

我是最小的新手，还是红宝石的新手，真的很厌倦尝试用谷歌搜索这个问题而没有结果.我将非常感谢您的帮助:

I am new to minitest and still new to ruby and really tired of trying to google this question without result. I would be really grateful for help:

在ruby minitest中assert_output的确切语法是什么?

What is the exact syntax of assert_output in ruby minitest?

我在github或其他地方找到的所有内容似乎都使用括号.但是，当我不使用带有assert_output的块时，会收到一条错误消息，这很有意义，因为此方法的定义包含yield语句.

All I find on github or elsewhere seems to use parentheses. Yet, I get an error message when I don't use a block with assert_output, which makes sense as the definition of this method contains a yield statement.

但是，无论我如何尝试，我都无法使其正常工作.

But I cannot make it work, whatever I try.

testclass.rb

testclass.rb

class TestClass
  def output
    puts 'hey'
  end
end

test_test.rb

test_test.rb

require 'minitest/spec'
require 'minitest/autorun'
require_relative 'testclass'


class TestTestClass < MiniTest::Unit::TestCase 
  def setup
    @test = TestClass.new
  end

  def output_produces_output
    assert_output( stdout = 'hey' ) { @test.output}
  end   
end 

我得到的是:

在0.000000s内完成测试，NaN测试/秒，NaN断言

Finished tests in 0.000000s, NaN tests/s, NaN assertions

0个测试，0个断言，0个失败，0个错误，0个跳过

0 tests, 0 assertions, 0 failures, 0 errors, 0 skips

我做错了什么? 这一定是完全显而易见的，但我无法弄清楚. 谢谢你的帮助.

What am I doing wrong? It must be something totally obvious, but I cannot figure it out. Thanks for your help.

推荐答案

要运行您的测试方法，方法名称必须以test_开头.另外， assert_output 的工作方式是该块将写入stdout /stderr，则将检查参数是否与stdout/stderr匹配.检查此IMO的最简单方法是传递一个正则表达式.因此，这就是我编写该测试的方式:

In order for your test method to run, the method name needs to start with test_. Also, the way assert_output works is that the block will write to stdout/stderr, and the arguments will be checked if they match stdout/stderr. The easiest way to check this IMO is to pass in a regexp. So this is how I would write that test:

class TestTestClass < MiniTest::Unit::TestCase 
  def setup
    @test = TestClass.new
  end

  def test_output_produces_output
    assert_output(/hey/) { @test.output}
  end   
end 

这篇关于Ruby minitest assert_output语法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！