Load plugin from master.
  
    $ antigen-bundle $PLUGIN_DIR &> /dev/null
    $ hehe
    hehe
  
  Load the plugin again. Just to see nothing happens.
  
    $ antigen-bundle $PLUGIN_DIR
    $ hehe
    hehe
  
  Confirm there is still only one repository.
  
    $ ls $ADOTDIR/repos | wc -l
    1
  
  Load a prezto style module. Should only source the `init.zsh` present in the
  module.
  
    $ antigen-bundle $PLUGIN_DIR2 &> /dev/null
    $ hehe2
    hehe2
  
  The alias defined in the other zsh file should not be available.
  
    $ unsourced-alias
    zsh: command not found: unsourced-alias
    [127]