Mock methods that receives a block as parameter

Question

I have a scenario more or less like this

class A
  def initialize(&block)
    b = B.new(&block)
  end
end

I am unit testing class A and I want to know if B#new is receiving the block passed to A#new. I am using Mocha as mock framework.

Is it possible?

Answer 1

I think you want:

l = lambda {}
B.expects(:new).with(l)
A.new(&l)

I know this works with RSpec, I'd be surprised if Mocha doesn't handle