car_steps.rb

Given /I am on the new make page/ do
  visits new_make_url
end

Then /a new make called "(\w+)" should be created/ do |name|
  Make.exists?(:name => name).should be_true
end

makes_controller.rb

  def create
    @make = Make.new(params[:make])
    if @make.save
      flash[:notice] = "Successfully created make."
      redirect_to @make
    else
      render :action => 'new'
    end 
  end 

manage_cars.feature

  Scenario: Register new make                         # features/manage_cars.feature:5
    Given I am an admin                               # features/step_definitions/shared_steps.rb:1
    And I am on the new make page                     # features/step_definitions/car_steps.rb:1
    When I attach the file at "tesla.jpg" to "logo"   # features/step_definitions/webrat_steps.rb:81
    And I fill in "name" with "Tesla"                 # features/step_definitions/webrat_steps.rb:14
    And I press "Submit"                              # features/step_definitions/webrat_steps.rb:6
    Then a new make called "Tesla" should be created  # features/step_definitions/car_steps.rb:14
      expected true, got false (Spec::Expectations::ExpectationNotMetError)
      ./features/step_definitions/car_steps.rb:15:in `Then /a new make called "(\w+)" should be created/'
      features/manage_cars.feature:11:in `Then a new make called "Tesla" should be created'

new.html

<form action="/makes" class="form smallform" enctype="multipart/form-data" id="new_make" method="post"><div style="margin:0;padding:0"><input name="authenticity_token" type="hidden" value="932617c3fc83c05f3d700bfd6ffdd79961fef034" /></div>
  <div class='bigbox'>
    <label for="make_name">Name</label>

    <input id="make_name" name="make[name]" size="30" type="text" />
    <label for="make_logo">Logo</label>
    <input id="make_logo" name="make[logo]" size="30" type="file" />
    <div class='bottom'>
      <input id="make_submit" name="commit" type="submit" value="Submit" />
    </div>
  </div>
</form>