wrong number of arguments (1 for 0) - ruby-on-rails

Question

I am setting up a test that should expect calls on two "subscriber" instances:
it "sends out sms to all the subscribers" do
#user.subscribers.create!
#user.subscribers.create!
Subscriber.any_instance.should_receive(:send_message).with(#message).times(2)
post :create, {:broadcast => valid_attributes}
end
The actual code is:
def create
#broadcast = Broadcast.new(params[:broadcast])
current_user.subscribers.each do |subscriber|
subscriber.send_message(#broadcast.message)
end
...
The error:
Failure/Error: post :create, {:broadcast => valid_attributes}
ArgumentError:
wrong number of arguments (1 for 0)
# ./app/controllers/broadcasts_controller.rb:41:in `block in create'
# ./app/controllers/broadcasts_controller.rb:40:in `create'
# ./spec/controllers/broadcasts_controller_spec.rb:73:in `block (4 levels) in <top (required)>'
For some reason, if I add the line: Subscriber.any_instance.should_receive(:send_message).with(#message).times(2), it fails with that error message. If I remove that line, the test runs smoothly (no wrong number of argument problem). What am I doing wrong?

Answer 1

The error you're getting is because the 'times' method is expected to be chained onto one of the other "receive count" expectations. You can use any one of the following:
should_receive(:send_message).with(#message).exactly(2).times
should_receive(:send_message).with(#message).at_most(2).times
You can also use one of the other alternatives that does not require the 'times' method:
should_receive(:send_message).with(#message).twice
should_receive(:send_message).with(#message).at_most(:twice)
More on that can be found in the rspec-mocks documentation
You may need to set the expectation BEFORE creating the subscribers:
it "sends out sms to all the subscribers" do
Subscriber.any_instance.should_receive(:send_message).with(#message).twice
#user.subscribers.create!
#user.subscribers.create!
post :create, {:broadcast => valid_attributes}
end