def test_rscu(self):
"""CodonUsage rscu should calculate synonymous usage correctly"""
c = CodonUsage({'UUU':3,'UUC':1,'ACA':1})
c.rscu()
self.assertEqual(c['UUU'], 0.75)
self.assertEqual(c['UUC'], 0.25)
self.assertEqual(c['ACA'], 1)
self.assertEqual(c['GGG'], 0)
