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v0.15.0-b1 Release

Compatibility with Flask>=2.2


* Initialize base_args as class field

Only include actual rule args in base_args

* Fix compatibility with Werkzeug 2.2

werkzeug.routing.parse_rule was considered an internal detail and has
been removed during a refactor. We can now rely on werkzeug.routing.Rule
which has a `arguments` field that contains the information we need.
However, this field is not populated until the Rule has been added to a
Map and this Map has been bound. So, we use a dummy map and bind it to
the empty string just to get the arguments field ready for our use.

* Rework test matrix, pass more exhaustive requirements to pip

- EOL python versions and alpha flask have been removed from test matrix
- Add python 3.10
- Only test "branches" of flask and not all bugfix releases

* Fix test_base_args

The tested view has a route_base with no declared arguments, so we
shouldn't expect the base_args to have a nonzero length.

* Rewrite test_rule_options

This test file mostly tests the same behavior over and over:
that the options given to `FlaskView.register`, such as
`strict_slashes`, are passed along to `Flask.add_url_rule`.

It did this by testing the behavior of the view when calling
its endpoints with or without the trailing slash, expecting it
to return the same response.

However, werkzeug never guaranteed this behavior. The only
documented behavior tunable by this option is:

"If strict_slashes is enabled (the default), visiting a branch URL
without a trailing slash will redirect to the URL with a slash
appended."

So, with the reimplementation of the routing in werkzeug 2.2, this
behavior is lost.

Instead of testing the behavior of the view, let's mock `add_url_rule`
and check that it's called with `strict_slashes` as `False`.

* Fix test_blueprints

Flask >=2.2 raises an error when trying to apply changes to an app
which has already serviced requests. For this specific test, we can
redefine the app.

* Pass rule_options to add_url_rules when adding a @route-ed rule

* Remove nose which is deprecated, use pytest

Signed-off-by: F.N. Claessen <[email protected]>