add helper class to analyze response.location

[bdauvergne]

Suggestion by @gawel, a new webtest.utils.URL class used to return response.location/content_location/url and simplify tests, with pytest you can write things as simple as:

     assert resp.location.match('https://example.org/a/b/c')
     assert resp.location.match('?foo=bar')

and you get clear errors on output

        def test_location(self):
        app = webtest.TestApp(debug_app)
        res = app.post('/')
        res.location = 'http://pylons.org'
        self.assertTrue(res.location.match('http://'))
>       self.assertTrue(res.url.match('https://truc.org'))
E       AssertionError: scheme differs http != https is not true

[gawel]

This project respect PEP8 80 char but you patch is not. Can you reformat your code ?

Can you also add a few doc strings/docs ? Maybe in docs/testresponse.rst

[gawel]

Can you choose a more specific name ? Maybe URLMissMatch ?

[bdauvergne]

Ok changed for URLMismatch.

[gawel]

You can avoid this if and always return an object if Error.__bool__ is conditional

[bdauvergne]

Done.

[bdauvergne]

This project respect PEP8 80 char but you patch is not. Can you reformat your code ?

It does not seem the case in tests/test_utils.py but ok.

Can you also add a few doc strings/docs ? Maybe in docs/testresponse.rst

Yep done.

[gawel]

LGTM. Thanks. I'll wait a few days before the merge in case someone wants to react