should_have_attributes

should_have_attributes.rb

module ShouldHaveAttributes

  class Validator
    def initialize object
      @object = object
    end 

    def method_missing name, *args, &block
      # puts "#{@object}.#{name}.should == #{args.first.inspect}"
      @object.send(name).should == args.first
    end 
  end 

  # Usage:
  #
  #   user.should_have_attributes do
  #     name  'Bob'
  #     email '[email protected]
  #   end
  #
  # or:
  #
  #   user.should_have_attributes do |u|
  #     u.name  'Bob'
  #     u.email '[email protected]
  #   end
  #
  # or:
  #
  #   user.should_have_attributes :name => 'Bob', :email => '[email protected]'
  #
  def should_have_attributes attributes = nil, &block
    unless attributes.nil?
      attributes.each {|key, value| self.send(key).should == value }
    end 

    Validator.new(self).indifferent_eval(&block) unless block.nil?
  end 
end

Object.send :include, ShouldHaveAttributes

user_spec.rb

# Without should_have_attributes
user = User.first
user.name.should    == 'bob'
user.api_key.should == '123456'
user.api_url.should == 'http://foo.com'

# Using block
User.first.should_have_attributes do
  name    'bob'
  api_key '123456'
  api_url 'http://foo.com'
end

# Passing attribute hash
User.first.should_have_attributes :name => 'bob', :api_key => '123456', :api_url => 'http://foo.com'