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Forked from txus/delegate_matcher.rb
Created April 5, 2012 13:26
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RSpec matcher for delegations
# RSpec matcher to spec delegations.
#
# Usage:
#
# describe Post do
# it { should delegate(:name).to(:author).with_prefix } # post.author_name
# it { should delegate(:month).to(:created_at) }
# it { should delegate(:year).to(:created_at) }
# end
RSpec::Matchers.define :delegate do |method|
match do |delegator|
@method = @prefix ? :"#{@to}_#{method}" : method
@delegator = delegator
begin
@delegator.send(@to)
rescue NoMethodError
raise "#{@delegator} does not respond to #{@to}!"
end
@delegator.stub(@to).and_return double('receiver')
@delegator.send(@to).stub(method).and_return :called
@delegator.send(@method) == :called
end
description do
"delegate :#{@method} to its #{@to}#{@prefix ? ' with prefix' : ''}"
end
failure_message_for_should do |text|
"expected #{@delegator} to delegate :#{@method} to its #{@to}#{@prefix ? ' with prefix' : ''}"
end
failure_message_for_should_not do |text|
"expected #{@delegator} not to delegate :#{@method} to its #{@to}#{@prefix ? ' with prefix' : ''}"
end
chain(:to) { |receiver| @to = receiver }
chain(:with_prefix) { @prefix = true }
end
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