在Rspec中模拟TCPSocket [英] Mock TCPSocket in Rspec

问题描述

我有一个简单的方法，可以连接到TCP服务器，并放入单行字符串并关闭连接.关闭连接后，该方法将重定向到特定页面.

I have a simple method which connects to a TCP server and puts single line of string and closes the connection. After the connection is closed the method redirects to a particular page.

我有兴趣测试该方法的重定向，并且不关心TCP连接值.因此，我最好的解决方法是模拟连接.这是方法，

I am in interested in testing the redirection of that method and do not care about the TCP connection values. Thus, my best option to get around is to mock the connection. Here is the method,

def print
  server = TCPSocket.new('a.b.c.d', 56423)
  server.puts "Hello Everyone"
  server.close

  redirect_to root_url
end

我的测试看起来像

it 'redirects to root_url' do
  get :print
  expect(response).to redirect_to(root_url))
end

我的问题是，我不知道如何模拟连接，以便可以转到重定向部分.有什么想法吗?

My problem is, I do not know how to mock the connection so that I can get to the redirect part. Any thoughts?

推荐答案

有许多方法可以做到，如

There are many ways to do this, as described in https://www.relishapp.com/rspec/rspec-mocks/v/3-0/docs. They vary in terms of syntax and the extent to which they constrain the execution.

最宽松的方法之一是在get调用之前添加以下内容:

One of the most permissive approaches would be to include the following prior to your get call:

server = double('server').as_null_object
TCPSocket.stub(:new).and_return(server)

这将允许/忽略传递给TCPSocket.new的任何参数，并忽略传递给该调用返回的对象的所有消息/参数.

This would permit/ignore any arguments passed to TCPSocket.new and ignore all messages/arguments passed to object returned from that call.

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