Rspec Mocks: mock / yield the block from a method call

lambda, mocking, rspec

Solution

Net::SSH.should_receive(:start).with(
  "server", "user", :password => "secret").and_yield(
  "whatever value the block should yield")

Not sure why you need to set `@started`, since the `should_receive` verifies that the method has been called.

Problem

I've got this code: ``` Net::SSH.start(@server, @username, :password => @password) do |ssh| output = ssh.exec!(@command) @logger.info 'SSH output: ' @logger.info output end ``` I can mock the SSH.Start using RSpec's mock framework like this, to tell me that I've started the SSH session: ``` Net::SSH.should_receive(:start).with("server", "user", :password => "secret") do @started = true end ``` this tells me whether or not i've @started the ssh session. now I need to mock the ssh.exec! method, which is easy enough: ``` Net::SSH.should_receive(:exec!).with("command")... ``` but how do I yield / call the block that contains the ssh.exec! method call, since I have mocked the SSH.start method? there's probably some simple method I can call to execute this block, but I don't know what it is and can't find any really good explanations / documentation on rspec's mocking framework.

Original source