Abstract Router interface for App and Group.

[kiyonlin]

Router interface defines all router handle interface includes app and group router.When dealing with sub-routers, users do not need to care about the specific implementation.

[Fenny]

Could you fix the error thrown by the tests? Thanks!

[kiyonlin]

Could you fix the error thrown by the tests? Thanks!

All tests passed on my machine before I created the pull request. I don’t know why it failed in the CI.

[Fenny]

##[error]./app.go:31:16: cannot use &(App literal) (value of type *App) as Router value in variable declaration: wrong type for method Add
##[error]./group.go:13:16: cannot use &(Group literal) (value of type *Group) as Router value in variable declaration: wrong type for method Add

If you could add a test case that would be great 👍

[kiyonlin]

Sorry for using wrong way to ensure App and Group implement Router interface. I’ll add a test case for this.

[renanbastos93]

Why do you add an interface that's be not using?
So we must set this contract with the struct sure.
e.g.

type Router interface{
    Get()
}

type Routing struct {
    Router
}

[kiyonlin]

@renanbastos93 This Router interface is for users who use fiber with sub-router.

e.g.

func setupRoutes(router fiber.Router) {
  router.Get("/path1", handler1);
  router.Post("/path2", handler2);
}

The router maybe an *App instance or a *Group instance.