Ruby minitest assert_output 语法 [英] Ruby minitest assert_output syntax

问题描述

我是 minitest 的新手，也是 ruby​​ 的新手，真的厌倦了在没有结果的情况下用谷歌搜索这个问题.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:

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.然而，当我不使用带有 assert_output 的块时，我收到一条错误消息，这是有道理的，因为此方法的定义包含一个 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.

但无论我怎么努力，我都无法让它发挥作用.

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:

0.000000 秒内完成的测试，NaN 测试/秒，NaN 断言

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

0 次测试，0 次断言，0 次失败，0 次错误，0 次跳过

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事情，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

为了让您的测试方法运行，方法名称需要以 test_ 开头.此外，assert_output 的工作方式是块将写入 stdout/stderr，并且将检查参数是否与 stdout/stderr 匹配.检查此 IMO 的最简单方法是传入正则表达式.所以这就是我编写测试的方式:

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！