* Add const constructor to TextInputFormatter

* Fix test

* Add abstract

* Add noSuchMethod
Signed-off-by: Shogo Hida <shogo.hida@gmail.com>

* Add @override and void
Signed-off-by: Shogo Hida <shogo.hida@gmail.com>

* Fix text and position of test
Signed-off-by: Shogo Hida <shogo.hida@gmail.com>
Signed-off-by: Shogo Hida <shogo.hida@gmail.com>