Test helper and mock functions.

    $ ANTIGEN_DEFAULT_REPO_URL=gh-user/repo

    $ b () {

    >     antigen-bundle "$@"
    > }
  
    $ -antigen-ensure-repo () {}
  
    $ -antigen-load () {
    >     echo "url:    $1"
    >     echo "dir:    $2"
    >     echo "is a:   $3"
    >     echo "clone?: $4"

    > }

  
  Short and sweet.

    $ b lol

    url:    https://github.com/gh-user/repo.git
    dir:    plugins/lol
    is a:   plugin
    clone?: true

  
  Short repo url.
  
    $ b github-username/repo-name

    url:    https://github.com/github-username/repo-name.git
    dir:    /
    is a:   plugin
    clone?: true

  
  Short repo url with `.git` suffix.
  
    $ b github-username/repo-name.git

    url:    https://github.com/github-username/repo-name.git
    dir:    /
    is a:   plugin
    clone?: true

  
  Long repo url.
  
    $ b https://github.com/user/repo.git

    url:    https://github.com/user/repo.git
    dir:    /
    is a:   plugin
    clone?: true

  
  Long repo url with missing `.git` suffix (should'nt add the suffix).
  
    $ b https://github.com/user/repo

    url:    https://github.com/user/repo
    dir:    /
    is a:   plugin
    clone?: true

  
  Short repo with location.
  
    $ b user/plugin path/to/plugin

    url:    https://github.com/user/plugin.git
    dir:    path/to/plugin
    is a:   plugin
    clone?: true

  Keyword arguments, in respective places.

    $ b --url=user/repo --loc=path/of/plugin

    url:    https://github.com/user/repo.git
    dir:    path/of/plugin
    is a:   plugin
    clone?: true

  
  Keyword arguments, in respective places, with full repo url.

    $ b --url=https://github.com/user/repo.git --loc=plugin/path

    url:    https://github.com/user/repo.git
    dir:    plugin/path
    is a:   plugin
    clone?: true

  
  Keyword arguments, in reversed order.

    $ b --loc=path/of/plugin --url=user/repo

    url:    https://github.com/user/repo.git
    dir:    path/of/plugin
    is a:   plugin
    clone?: true

  
  Mixed positional and keyword arguments, and skip `loc`.

    $ b user/repo --loc=plugin/loc

    url:    https://github.com/user/repo.git
    dir:    plugin/loc
    is a:   plugin
    clone?: true

  
  Just `loc`, using keyword arguments.
  
    $ b --loc=plugin/path

    url:    https://github.com/gh-user/repo.git
    dir:    plugin/path
    is a:   plugin
    clone?: true

  TODO: Error reporting with erroneous arguments or usage with incorrect syntax.