anchor.diff:  # Install Coffeescript
   RUN npm -g install coffee-script
   
  -# Install Node testing frameworks
  -RUN npm -g install chai
  -RUN npm -g install mocha
  -
  -# Install additional node frameworks
  -RUN npm install immutable
  +# Install Node testing frameworks & additional frameworks
  +RUN npm -g install chai mocha immutable
   
   # Install Lua
   RUN apt-get install -y lua5.2
  
positive.code: RUN apt-get install -y sqlite libsqlite3-dev
  
  RUN gem install sqlite3 --no-ri --no-rdoc
  RUN npm install sqlite3
  
  # Install MongoDB
  RUN apt-get install -y mongodb-server && \
  
negative.code: ENV TERM linux
  RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
  
  # ADD codewarrior user
  RUN useradd codewarrior
  RUN rm -rf ~codewarrior && cp -a ~root ~codewarrior && chown -R codewarrior:codewarrior ~codewarrior
  RUN apt-get install -y python python-dev python-pip python-virtualenv
  
  # Define mountable directories.
  
  # Install Node.js
  RUN add-apt-repository ppa:chris-lea/node.js
  RUN apt-get update 
  RUN apt-get install -y nodejs
  RUN su codewarrior -c "echo '\n# Node.js\nexport PATH=\"/codewars/node_modules/.bin:$PATH\"' >> ~codewarrior/.bash_profile"
  
  # Define default command.
  CMD ["bash"]
  