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module RSpec
module Matchers
module BuiltIn
class RespondTo
def initialize(*names)
@names = names
@expected_arity = nil
end
def matches?(actual)
find_failing_method_names(actual, :reject).empty?
end
alias == matches?
def does_not_match?(actual)
find_failing_method_names(actual, :select).empty?
end
def failure_message_for_should
"expected #{@actual.inspect} to respond to #{@failing_method_names.collect {|name| name.inspect }.join(', ')}#{with_arity}"
end
def failure_message_for_should_not
failure_message_for_should.sub(/to respond to/, 'not to respond to')
end
def description
"respond to #{pp_names}#{with_arity}"
end
def with(n)
@expected_arity = n
self
end
def argument
self
end
alias :arguments :argument
private
def find_failing_method_names(actual, filter_method)
@actual = actual
@failing_method_names = @names.__send__(filter_method) do |name|
@actual.respond_to?(name) && matches_arity?(actual, name)
end
end
def matches_arity?(actual, name)
return true unless @expected_arity
actual_arity = actual.method(name).arity
if actual_arity < 0
# ~ inverts the one's complement and gives us the number of required args
~actual_arity <= @expected_arity
else
actual_arity == @expected_arity
end
end
def with_arity
@expected_arity.nil?? "" :
" with #{@expected_arity} argument#{@expected_arity == 1 ? '' : 's'}"
end
def pp_names
# Ruby 1.9 returns the same thing for array.to_s as array.inspect, so just use array.inspect here
@names.length == 1 ? "##{@names.first}" : @names.inspect
end
end
end
end
end
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