def test_evaluation_simple(self):
two_plus_two = Operation(OperationType.PLUS(),
[Variable(2.0), Variable(2.0)])
two_plus_two_divided_by_four = Operation(
OperationType.DIVIDE(), [two_plus_two, Variable(4)])
self.assertTrue(two_plus_two_divided_by_four.is_evaluatable())
self.assertAlmostEqual(two_plus_two_divided_by_four.evaluate(), 1)
def test_evaluation_trivial(self):
two = Operation(OperationType.POSITIVE(), [Variable('2')])
self.assertTrue(two.is_evaluatable())
self.assertAlmostEqual(two.evaluate(), 2)
x = Operation(OperationType.POSITIVE(), [Variable('x')])
self.assertFalse(x.is_evaluatable())