def test_parse_term_with_valid_strings(self):
with self.subTest('2'):
term = Term.parse_term('2')
expected_term = Term.constant(2)
self.assertEqual(term, expected_term)
with self.subTest('x'):
term = Term.parse_term('x')
expected_term = Term(coeff=1, variable='x', power=1)
self.assertEqual(term, expected_term)
with self.subTest('x^2'):
term = Term.parse_term('x^2')
expected_term = Term(coeff=1, variable='x', power=2)
self.assertEqual(term, expected_term)
with self.subTest('2*x'):
term = Term.parse_term('2*x')
expected_term = Term(coeff=2, variable='x', power=1)
self.assertEqual(term, expected_term)
with self.subTest('2*x^2'):
term = Term.parse_term('2*x^2')
expected_term = Term(coeff=2, variable='x', power=2)
self.assertEqual(term, expected_term)
def parse_from_string(cls, s):
unparsed_terms = s.split('+')
terms = [Term.parse_term(t) for t in unparsed_terms]
return cls(terms)
def test_parse_term_with_invalid_string(self):
with self.assertRaises(Exception):
Term.parse_term('2*2*x')
