import unittest

class Calculate:

    def __init__(self):
        pass

    def add(self, x, y):
        return x+y

    def sub(self, x, y):
        return x-y


class Tests(unittest.TestCase):

    def testA(self):
	calc=Calculate()
        self.assertEquals(3+4, calc.add(3, 4))

    def testB(self):
	calc=Calculate()
        self.assertEquals(2-1, calc.sub(2, 1))


if __name__ == "__main__":
    unittest.main()