def test_normal(self):
summand = summand_class.Summand('+3.76xyz^3')
self.assertEqual(summand.get_sign(), '+')
summand.flip_sign()
self.assertEqual(summand.get_sign(), '-')
self.assertEqual(summand.get_coefficient(), 3.76)
self.assertEqual(summand.get_operand(), 'xyz^3')
self.assertEqual(summand.get_original_form(), '+3.76xyz^3')
def test_multiple_power(self):
summand = summand_class.Summand('-4.78x^2y^5z^8')
self.assertEqual(summand.get_sign(), '-')
summand.flip_sign()
self.assertEqual(summand.get_sign(), '+')
self.assertEqual(summand.get_coefficient(), 4.78)
self.assertEqual(summand.get_operand(), 'x^2y^5z^8')
self.assertEqual(summand.get_original_form(), '-4.78x^2y^5z^8')
def test_no_power(self):
summand = summand_class.Summand('-3.78xyz')
self.assertEqual(summand.get_sign(), '-')
summand.flip_sign()
self.assertEqual(summand.get_sign(), '+')
self.assertEqual(summand.get_coefficient(), 3.78)
self.assertEqual(summand.get_operand(), 'xyz')
self.assertEqual(summand.get_original_form(), '-3.78xyz')
def test_constant(self):
summand = summand_class.Summand('-6.78')
self.assertEqual(summand.get_sign(), '-')
summand.flip_sign()
self.assertEqual(summand.get_sign(), '+')
self.assertEqual(summand.get_coefficient(), 6.78)
self.assertEqual(summand.get_operand(), '')
self.assertEqual(summand.get_original_form(), '-6.78')
def test_no_coefficient(self):
summand = summand_class.Summand('- xy^7')
self.assertEqual(summand.get_sign(), '-')
summand.flip_sign()
self.assertEqual(summand.get_sign(), '+')
self.assertEqual(summand.get_coefficient(), 1.0)
self.assertEqual(summand.get_operand(), 'xy^7')
self.assertEqual(summand.get_original_form(), '- xy^7')
def test_exception(self):
try:
summand = summand_class.Summand('+4.5x^2y^3z^4')
except ValueError as ex:
self.assertEqual(ex.message, 'Illegal summand: +4.5x^2y^3z^4')