class RSpec::Matchers::BuiltIn::RespondTo::ArityCheck

def initialize(expected_arity, expected_keywords, arbitrary_keywords, unlimited_arguments)
  expectation = Support::MethodSignatureExpectation.new
  if expected_arity.is_a?(Range)
    expectation.min_count = expected_arity.min
    expectation.max_count = expected_arity.max
  else
    expectation.min_count = expected_arity
  end
  expectation.keywords = expected_keywords
  expectation.expect_unlimited_arguments = unlimited_arguments
  expectation.expect_arbitrary_keywords  = arbitrary_keywords
  @expectation = expectation
end

def matches?(actual, name)
  return true if @expectation.empty?
  verifier_for(actual, name).with_expectation(@expectation).valid?
end

def method_signature_for(actual, name)
  method_handle = Support.method_handle_for(actual, name)
  if name == :new && method_handle.owner === ::Class && ::Class === actual
    Support::MethodSignature.new(actual.instance_method(:initialize))
  else
    Support::MethodSignature.new(method_handle)
  end
end

def verifier_for(actual, name)
  Support::StrictSignatureVerifier.new(method_signature_for(actual, name))
end