def testSample(self):
dictionary = ['ART', 'RAT', 'CAT', 'CAR']
alphabet = Alphabet()
result = alphabet.get_alphabet(dictionary)
self.assertIn(result, (['A', 'T', 'R', 'C'], ['T', 'A', 'R', 'C']))
def testEmpty(self):
dictionary = []
alphabet = Alphabet()
result = alphabet.get_alphabet(dictionary)
self.assertEqual(result, [])
def testOneLetter(self):
dictionary = ['a', 'aa', 'aaa', 'aaaa']
alphabet = Alphabet()
result = alphabet.get_alphabet(dictionary)
self.assertEqual(result, ['a'])
