>>> from choir2 import dicc_soloists

>>> d = dicc_soloists('choir2.txt')
>>> if d!= {'bass': ['Xema'], 'soprano': ['Fina', 'Fineta', 'Pepeta'],
... 'tenor': ['Josemari', 'Josep', 'Pep'], 
... 'alto': ['Josefina', 'Mariajosep']}:
...    print(d)