def test_tokenize_addition(self):
'''Tokenizes a rpn expression'''
self.assert_tokenize('4 2 +', [4, 2, make_operator('+')])
def test_make_operator_add(self):
'''Addition operator should add'''
stack = [4, 2]
operator = make_operator('+')
operator(stack)
self.assertEqual(stack.pop(), 6)
def test_tokenize_with_operator(self):
'''Tokenizes operators correctly'''
self.assert_tokenize('+', [make_operator('+')])
def test_tokenize_division(self):
'''Tokenizes a rpn division'''
self.assert_tokenize('4 2 /', [4, 2, make_operator('/')])
def test_tokenize_multiplication(self):
'''Tokenizes a rpn subtraction'''
self.assert_tokenize('4 2 *', [4, 2, make_operator('*')])
def test_make_operator_multiply(self):
'''Multiplication operator should multiply'''
stack = [4, 2]
operator = make_operator('*')
operator(stack)
self.assertEqual(stack.pop(), 8)
def test_tokenize_subtraction(self):
'''Tokenizes a rpn subtraction'''
self.assert_tokenize('4 2 -', [4, 2, make_operator('-')])
def test_make_operator_subtract(self):
'''Division operator should divide'''
stack = [4, 2]
operator = make_operator('/')
operator(stack)
self.assertEqual(stack.pop(), 2)
def test_make_operator_subtract(self):
'''Subtraction operator should add'''
stack = [4, 2]
operator = make_operator('-')
operator(stack)
self.assertEqual(stack.pop(), 2)
def test_execute_addition(self):
'''Should execute an addition correctly'''
self.assert_execute([4, 2, make_operator('+')], 6)
def test_execute_multiplication(self):
'''Should execute a multiplication correctly'''
self.assert_execute([4, 2, make_operator('*')], 8)
def test_execute_division(self):
'''Should execute a division correctly'''
self.assert_execute([4, 2, make_operator('/')], 2)