def test_negation(self):
e = Equation()
x = e.element(-1)
e.create_sub(-1, x / 2)
e.create_negation(-1)
self.assertEqual(str(e), '1 1/2 + (-1/2)')
e.create_negation(-1)
self.assertEqual(str(e), '1 1/2 - (-(-1/2))')
def test_negative(self):
e = Equation(-1)
self.assertEqual(str(e), '-1')
e = Equation()
e.create_negation(-1)
self.assertEqual(str(e), '-(-1)')
e = Equation(-1)
e.create_negation(-1)
self.assertEqual(str(e), '-(-(-1))')
