mocks cheat sheet

stub = stub("stub")

customer = double("customer")
# single stub
customer = double("customer", :name => 'Bryan')
# multiple stubs
customer = double("customer", :name => 'Bryan', :open_source_projects => ['WebRat', 'Rack::Test'])
# single stub
customer.stub(:name).and_return("Aslak")
customer.should_receive(:name).and_return("Aslak")

logger = mock('logger')
logger.should_receive(:log).with(/Statement generated for Aslak/)
account.should_receive(:withdraw).with(target_account, instance_of(Fixnum))
account.should_receive(:withdraw).with(anything(), instance_of(Fixnum))
account.should_receive(:withdraw).with(any_args())
account.should_receive(:withdraw).with(no_args())
account.should_receive(:withdraw).with(hash_including('electric' => '123', 'gas' => '432'))
account.should_receive(:withdraw).with(hash_not_including('electric' => '123', 'gas' => '432'))

widget = Widget.new
Widget.stub!(:find).and_return(widget)
widget.stub!(:update_attribues).and_return(true)

Widget.should_receive(:update_attributes).with("37").and_return(widget)

ages = double('ages').stub(:age_for) do |what|
	if what == 'drinking'
		21
	elsif what == 'voting'
		18
	end
end
# ActiveRecord named scopes method chains 
article = double()
Article.stub_chain(:recent, :published, authored_by).and_return(article)
# counts
account.should_receive(:withdraw).exactly(1).times
account.should_receive(:withdraw).at_least(5).times
account.should_receive(:withdraw).at_most(1).times
account.should_receive(:withdraw).once
account.should_receive(:withdraw).twice
account.should_receive(:withdraw).never
account.should_not_receive(:withdraw)
account.should_receive(:withdraw).and_raise
account.should_receive(:withdraw).and_raise(InsufficientFunds)
account.should_receive(:withdraw).and_throw(:insufficient_funds)

# enforce an order add must follow multiply
result.should_receive(:multiply).ordered
result.should_receive(:add).ordered

# custom argument matchers
calculator.should_receive(:add).with(greater_than(3))
class GreaterThanMatcher
	def initialize(expected)
		@expected = expected
	end
	def ==(actual)
		actual > @expected
	end
	def description
		"a number greater than #{@expected}"
	end
end
def greater_than(floor)
	GreaterThanThreeMatcher.new(floor)
end