Uninitialized constant (NameError) problem – how to include a class?

Here is my directory structure:


When I run


in the root of my project, I get an uninitialized string constant Ninja (NameError) error. I’ve determined it’s caused by this line in my ninja_steps.rb file:

@ninja = Ninja.new :belt_level => belt_level

In my ninja.rb file:

class Ninja
  def initialize (belt_level)

Do I need to add some sort of require at the top of my ninja_steps.rb file, or what? I can’t seem to figure out how to do that so that it doesn’t bomb out.

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  • 2 Solutions collect form web for “Uninitialized constant (NameError) problem – how to include a class?”

    Did you try adding an include at the top of the ninja_steps? Something like

    require File.expand_path(File.dirname(__FILE__) + "/../../src/ninja")

    should do the trick. Otherwise, cucumber has no idea what a Ninja is. 🙂

    To load all those files in a slightly different way than Bill Turner suggests, taking a hint from projects like cucumber/aruba:


    # env.rb
    # add your src dir to the load path
    $LOAD_PATH.unshift(File.dirname(__FILE__) + '/../../src')
    require 'ninja'
    Ruby is the best programming language in the world - Ruby on Rails.