>>> from nba import group

>>> d = group('nba.txt')
>>> d == {'Atlantic': ['Boston Celtics', 'Brooklyn Nets', 'Toronto Raptors'],
... 'Central': ['Chicago Bulls', 'Cleveland Cavaliers', 'Indiana Pacers'],
... 'Northwest': ['Oklahoma City Thunder', 'Portland Trail Blazers',
... 'Utah Jazz'], 'Southeast': ['Orlando Magic', 'Washington Wizards'],
... 'Pacific': ['Los Angeles Lakers', 'Phoenix Suns', 'Sacramento Kings'],
... 'Southwest': ['Dallas Mavericks', 'New Orleans Pelicans', 'San Antonio Spurs']}
True