<filename>test_gurbert/test_num.py
class Calculate:
    def __init__(self, num):
        self.num = num

    def add(self):
        return 1 + self.num

<filename>test_gurbert/test_num.py
class Calculate:
    def __init__(self, num):
        self.num = num

    def add(self):
        return 1 + self.num
