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respond_to.rb
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respond_to.rb
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RSpec::Support.require_rspec_support "method_signature_verifier"
module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for `respond_to`.
# Not intended to be instantiated directly.
class RespondTo < BaseMatcher
def initialize(*names)
@names = names
@expected_arity = nil
end
# @api public
# Specifies the number of expected arguments.
#
# @example
# expect(obj).to respond_to(:message).with(3).arguments
def with(n)
@expected_arity = n
self
end
# @api public
# No-op. Intended to be used as syntactic sugar when using `with`.
#
# @example
# expect(obj).to respond_to(:message).with(3).arguments
def argument
self
end
alias :arguments :argument
# @private
def matches?(actual)
find_failing_method_names(actual, :reject).empty?
end
# @private
def does_not_match?(actual)
find_failing_method_names(actual, :select).empty?
end
# @api private
# @return [String]
def failure_message
"expected #{@actual.inspect} to respond to #{@failing_method_names.map { |name| name.inspect }.join(', ')}#{with_arity}"
end
# @api private
# @return [String]
def failure_message_when_negated
failure_message.sub(/to respond to/, 'not to respond to')
end
# @api private
# @return [String]
def description
"respond to #{pp_names}#{with_arity}"
end
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
signature = Support::MethodSignature.new(actual.method(name))
Support::StrictSignatureVerifier.new(signature, Array.new(@expected_arity)).valid?
end
def with_arity
return "" unless @expected_arity
" 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