1. Support multiple [Http*] attributes on an action.
2. Support multiple [Route] attributes on a controller and on an action.
3. Support creating multiple attribute routes using [AcceptVerbs("...", Route = "...")]
4. Detect attribute routed actions during action discovery and return one action per [Http*],
[Route] or [AcceptVerbs] attribute found on the method when there is at least one valid attribute route.
5. Merge all the HTTP methods of [Http*] and [AcceptVerbs] attributes in a method during
action discovery when there are no valid attribute routes defined on the action.
6. Build one action descriptor per controller [Route] + action [Http*], [AcceptVerbs]
or [Route] combination in an action.
7. Disallow the use of attributes that do not implement IActionHttpMethodProvider and
IRouteTemplateProvider simultaneously in methods that define attribute routed
actions and throw an exception during startup.
8. Disallow mixing attribute routed and non attribute routed actions on the same method
and throw an exception during startup.
This change exludes internal and nested types from being treated as
controllers. This is consistent with MVC5's behavior.
DefaultActionSelectionConventions was primarily tested through running
action selection. I wanted to also test the methods with substantial logic
in this class, so I moved a spate of a classes from private classes inside of the
integration tests to public classes so they could be shared. I also added
tests to fill gaps in DefaultActionSelectionConventions, which is the vast
vast majority of this change.