welcome_helper.rb

# welcome_helper.rb:
module WelcomeHelper
  def manage_samples_link
    return nil if current_user.blank?
    if current_user.role?(:submitter) || 
        current_user.role?(:reviewer) ||
        current_user.role?(:admin)
      link_to "Manage Samples", manage_samples_path
    end
  end
end
require 'spec_helper'

# welcome_helper_spec.rb:
describe WelcomeHelper do

  %w{ submitter reviewer admin }.each do |rolename|
    it "should return manage samples link for user with role #{rolename}" do
      role = Role.new(:rolename => rolename)
      user = User.new(:roles => [role])
      helper.stub(:current_user).and_return(user)
      link = %{<a href="/manage_samples">Manage Samples</a>}
      helper.manage_samples_link.should == link
    end
  end

end