gistfile1.sh

#! /usr/bin/env bash
# Change to your home dir.
cd ~/

if [ -a /usr/local/bin/composer ]; then
  echo "You already have composer"
  composerpath='composer'
else
  # Get the composer.phar file.
  curl -S http://getcomposer.org/installer | php

  if [[ "$PATH" == *"/usr/local/bin"* ]]; then
    # Move composer to a global folder in your $PATH;
    sudo mv composer.phar /usr/local/bin/composer
    composerpath='composer'
  else
    echo "Could not find global directory in path, using the local version to get stuff";
    composerpath='php ~/composer.phar'
  fi
fi

# Install testing components globally - this means you can run them from anywhere on your computer.
$composerpath global require behat/behat
$composerpath global require behat/mink
$composerpath global require behat/mink-goutte-driver
$composerpath global require behat/mink-selenium2-driver
$composerpath global require squizlabs/php_codesniffer
$composerpath global require squizlabs/mink-extension
$composerpath global require phpunit/phpunit

Once you've done this, you need to add ~/.composer/vendor/bin to your $PATH. You can do that by adding:

export PATH='~/.composer/vendor/bin:$PATH'

to ~/.bash_profile or ~/.bashrc