Improved the code quality in the core/test file
Improved the code quality in the core/test file

Signed-off-by: Davide <5d8a2f29f1641b417910119d1867b6dbe5869f9b@gmail.com>

RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu