capybara_assertions.rb

module CapybaraAssertions                                                           
  def css_assertion_builder(outcome, selector, text, message)                       
    if text                                                                         
      options = { :text => text }                                                   
      message ||= "#{outcome} have found '#{selector}' containing '#{text}'"        
    else                                                                            
      options = {}                                                                  
      message ||= "#{outcome} have found '#{selector}'"                             
    end                                                                             
    is_present = page.has_css?(selector, options)                                   
    case outcome                                                                    
      when 'should'                                                                 
        assert is_present, message                                                  
      when 'should not'                                                             
        fail message if is_present                                                  
    end                                                                             
  end                                                                               
                                                                                    
  def assert_has_css(selector, text = nil, message = nil)                           
    css_assertion_builder('should', selector, text, message)                        
  end                                                                               
                                                                                    
  def fail_if_has_css(selector, text = nil, message = nil)                          
    css_assertion_builder('should not', selector, text, message)                    
  end                                                                               
end