测试子类初始化方法的清晰度

Question

我是面向对象的新手。我正在尝试测试我的 RightPyramid init 方法，不确定是否有办法像我的 RightPyramid init 没有任何参数。

from typing import List
from abc import ABCMeta, abstractmethod

class Triangle(metaclass=ABCMeta):
    def __init__(self, base: int, height: int) -> None:
        assert base >= 0, "base must be greater or equal to 0"
        assert height >= 0, "height must be greater or equal to 0"
        self.base = base
        self.height = height

    @abstractmethod
    def area(self) -> int:   
        pass


class RightPyramid(Triangle):
    def __init__(self):
        Triangle.__init__(self, 3, 2)

    def area(self):
        return 0.5 * self.base + self.height

Answer 1

测试RightPyramid，执行以下代码：

rp = RightPyramid()

实际上会调用RightPyramid.__init__()方法，self被实例替换并在rp变量中返回。

Answer 2

如果你想测试你的三角形基础 class 行为，你应该创建新的 class :

class TestInit(Triangle):
    def __init__(self):
        Triangle.__init__(self, -3, 2) # this should throw an assertion fail

t = TestInit()

测试子类初始化方法的清晰度

Clarity on Testing subclass init method

python

unit-testing

inheritance

abstract-class

init