gistfile1.txt

# Helper : app/helpers/bookings_helper.rb
module BookingsHelper
  def booking_price(booking)
    "something"
  end
end

# Helper spec : spec/helpers/bookings_helper_spec.rb
require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')

describe BookingsHelper do
  describe "#booking_price" do
    helper.booking_price.should == 'something'
  end
end

# Error
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/active_support/whiny_nil.rb:48:in `method_missing': undefined method `booking_price' for nil:NilClass (NoMethodError)