class RSpec::Support::MethodSignatureVerifier

def error_message
  if missing_kw_args.any?
    "Missing required keyword arguments: %s" % [
      missing_kw_args.join(", ")
    ]
  elsif invalid_kw_args.any?
    "Invalid keyword arguments provided: %s" % [
      invalid_kw_args.join(", ")
    ]
  elsif !valid_non_kw_args?
    "Wrong number of arguments. Expected %s, got %s." % [
      @signature.non_kw_args_arity_description,
      non_kw_args
    ]
  end
end