Proposed RSpec Rails matcher for response checks

gistfile1.rb

class RespondWithMatcher < RSpec::Matchers::BuiltIn::BaseMatcher

  def initialize(scope, expected, message = nil)
    @expected = case expected
                when Symbol, Fixnum
                  expected
                when String
                  expected.to_sym
                else
                  raise ArgumentError, "Unexpected type #{expected} must be symbol or Fixnum"
                end
    @message = message
    @scope = scope
  end

  # @api private
  def matches?(*)
    match_unless_raises ActiveSupport::TestCase::Assertion do
      @scope.assert_response expected, @message
    end
  end

  # @api private
  def failure_message_for_should
    rescued_exception.message
  end

  # @api private
  def failure_message_for_should_not
    "expected not to respond with #{expected.inspect}, but did"
  end
end

# Delegates to `assert_response`
#
# @example
#
#     expect(response).to have_responded_with("new")
def have_responded_with(type, message = nil)
  RespondWithMatcher.new(self, type, message)
end
alias_method :respond_with, :have_responded_with