def test_bases(self):
"""CodonUsage bases should count bases correctly"""
u = CodonUsage('UUUCCCUAGCCCGGGAA')
b = u.bases()
self.assertEqual(b, BaseUsage('UUUCCCUAGCCCGGGAA'))
#purge_unwanted should get rid of bad codons
b = u.bases(purge_unwanted=True)
self.assertEqual(b, BaseUsage('UUUCCCCCCGGG'))
