I think kuroze kun isn't testing mugi but giving her some space to think about her future, cuz right now in mugi`s head is all about kurose how he's not in the same class and how she want to go to college with him. I think he want mugi to think about herself more without kuroze in her mind cuz they are in those phase where u should decide ur life ahead┗( T﹏T )┛