Question

I am having trouble mocking an injected object. For example:

class Foo
  def initialize(bar = Bar.new)
    @bar = bar
  end

  def run
    @bar.do_something_cool
  end
end

# Rspec
describe Foo do
  it "should do something cool" do
    mock_bar = mock("bar")
    mock_bar.stub(:do_something_cool).and_return(nil)

    real_foo = Foo.new(mock_bar)
    real_foo.run

    mock_bar.should_receive(:do_something_cool).once
  end
end

If I run this, the spec fails because it says the “do_something_cool” is never called.

 expected: 1 time
 received: 0 times

However, if I do not stub “do_something_cool”, I get the following error

Mock "bar" received unexpected message :do_something_cool with (no args)

Any ideas?

Answer 1

mock_bar.should_receive(:do_something_cool).once 

should be before

real_foo.run