def test_Multiply_Input_Neg3_4_Returns_12(self):
# Arrange
leftNum = SingleNumberExpression(-3)
rightNum = SingleNumberExpression(4)
binaryExpression = MultiplicationExpression(leftNum, rightNum)
# Act
actual = binaryExpression.evaluate()
expected = -12
# Assert
self.assertEqual(actual, expected)
def test_Multiply_Sum_2_1_And_Sum_1_3_Returns_12(self):
# Arrange
leftExpression = AdditionExpression(SingleNumberExpression(2),
SingleNumberExpression(1))
rightExpression = AdditionExpression(SingleNumberExpression(1),
SingleNumberExpression(3))
entireExpression = MultiplicationExpression(leftExpression,
rightExpression)
# Act
actual = entireExpression.evaluate()
expected = 12
# Assert
self.assertEqual(actual, expected)
def CreateExpression(self, leftExp, operatorSign, rightExp):
if (operatorSign == "+"):
return AdditionExpression(leftExp, rightExp)
if (operatorSign == "-"):
return SubtractionExpression(leftExp, rightExp)
if (operatorSign == "/"):
return DivisionExpression(leftExp, rightExp)
return MultiplicationExpression(leftExp, rightExp)
def test_Divide_Difference_11_1_And_Product_2_5_Returns_1(self):
# Arrange
leftExpression = SubtractionExpression(SingleNumberExpression(11),
SingleNumberExpression(1))
rightExpression = MultiplicationExpression(SingleNumberExpression(2),
SingleNumberExpression(5))
entireExpression = DivisionExpression(leftExpression, rightExpression)
# Act
actual = entireExpression.evaluate()
expected = 1
# Assert
self.assertEqual(actual, expected)