def test_symmetric(self):
polymer = 'abcdefgGFEDCBA'
result = react_polymer(polymer)
expected = ''
self.assertEqual(result, expected)
def test_example(self):
polymer = 'dabAcCaCBAcCcaDA'
result = react_polymer(polymer)
expected = 'dabCBAcaDA'
self.assertEqual(result, expected)
def test_single_reaction(self):
polymer = 'bB'
result = react_polymer(polymer)
expected = ''
self.assertEqual(result, expected)
def test_simple_nothing_reacts(self):
polymer = 'aabAAB'
result = react_polymer(polymer)
expected = 'aabAAB'
self.assertEqual(result, expected)
def test_reacts_to_nothing(self):
polymer = 'abBA'
result = react_polymer(polymer)
expected = ''
self.assertEqual(result, expected)