Adding environ argument to enable testing of forms

[oceanites]

I tried to test my application using boddle and stumpled upon two problems:

• As @signalw mentioned in throw error if 'environ' in extra arg. remove extra_orig. #7: forms is not testable
• I'm using beaker for session handling and tried to add the data using the extra args:
  • boddle(beaker.session='session') obviously doesn't work (It tries to access attribute session from a not existing beaker object), as well as boddle('beaker.session'='session')
  • When providing it as a dictionary boddle(**{'beaker.session': 'session'}), the value is stored in bottle.request.ext.beaker.session and therefore, only accessible with getattr(bottle.request, 'beaker.session')

To solve this issue i propose adding an extra argument environ for the context manager. This solves both issues, forms can be preset with boddle(environ={'bottle.request.forms': formdata}). Beaker session data using boddle(environ={'beaker.session': sessiondata}).

[Marrin]

This seems also be useful/needed to test routes with Basic Auth to set the REMOTE_USER environment variable.