Question

我是Ruby的单元测试的新手，我在创建一个检查STDOUT的规范时遇到了一些麻烦。我知道如果我正在测试的代码是在类/方法中，如何测试STDOUT，但我想测试来自不在Class或Method中的常规Ruby文件的puts语句。

以下是来自my_file.rb

的简单一行班轮

puts "Welcome to the Book Club!"

这是规范

my_spec.rb

require_relative 'my_file.rb'

  describe "Something I'm Testing" do
    it 'should print Welcome to the Book Club!' do

        expect {$stdout}.to output("Welcome to the Book Club!\n").to_stdout

      end
    end

我收到以下错误消息：

Failures:

  1) Something I'm Testing should print Welcome to the Book Club!
     Failure/Error: expect {$stdout}.to output("Welcome to the Book Club!\n").to_stdout

       expected block to output "Welcome to the Book Club!\n" to stdout, but output nothing
       Diff:
       @@ -1,2 +1 @@
       -Welcome to the Book Club!
       # ./spec/my_spec.rb:9:in `block (2 levels) in <top (required)>'

Finished in 0.01663 seconds (files took 0.08195 seconds to load)
1 example, 1 failure

Failed examples:

rspec ./spec/my_spec.rb:7 # Something I'm Testing should print Welcome to the Book Club!

我以为我可以使用$stdout从my_file.rb捕获STDOUT，但这不起作用。输出一直没有说。我发现这篇文章讲的是通过StringIO Testing STDOUT output in Rspec

捕获输出

但这种方法对我不起作用。我做错了什么？

谢谢！

Answer 1

在测试运行之前，将puts权限放在顶部，即可调用my_file.rb方法。将其包含在您的测试中。

describe "Something I'm Testing" do
  it 'should print Welcome to the Book Club!' do
     expect { require_relative 'my_file.rb' }.to output("Welcome to the Book Club!\n").to_stdout
  end
end

在RSpec中捕获STDOUT

1 个答案: