python 调用其他方法的单元测试方法

Question

实施基本 space 几何 class

Class Geometry(object):

    # radius is required and must be float
    def circleSurface(self, radius):
        if not isinstance(radius, float):
            raise AttributeError("best to enter a float as radius")
        else:
            return radius*radius*3.14

    # height and radius are required and must be floats
    def cylinderVolume(self, radius, height):
        if not isinstance(height, float):
            raise AttributeError("best to enter a float as height")
        else:
            return self.circleSurface(radius) * height

并编写一个基本的几何图形class测试器

import unittest
import Geometry

class GeometryTest(unittest.TestCase):
    def test_circleSurfaceRaisesAttributeErrorWhenRadiusIsNotFloat(self):
        with self.assertRaises(AttributeError) as raised_exception:
            Geometry.circleSurface(radius = "B")
        self.assertEqual(str(raised_exception.exception), "best to enter a float as radius")

    def test_cylinderVolumeRaisesAttributeErrorWhenHeightIsNotFloat(self):
        with self.assertRaises(AttributeError) as raised_exception:
            Geometry.cylinderVolume(radius = 1.0, height = "B")
        self.assertEqual(str(raised_exception.exception), "best to enter a float as height")

似乎可以做到，但我也想在 cylinderVolume 方法中测试半径是否为浮点数，即使它是调用 circleSurface 方法时固有的：

    def test_cylinderVolumeRaisesAttributeErrorWhenRadiusIsNotFloat(self):
        with self.assertRaises(AttributeError) as raised_exception:
            Geometry.cylinderVolume(radius = "B", height = 1.0)
        self.assertEqual(str(raised_exception.exception), "best to enter a float as radius")

测试调用 cylinderVolume 的所有参数感觉很自然。

我知道添加最后一个测试不会导致任何 'overhead' 或大量时间消耗，您不妨这样做，但另一方面它似乎有点多余、矫枉过正和重复代码。只是想知道是否有解决此类测试的特定标准。

Answer 1

cylinderVolume 调用 circleSurface 是实现细节。您知道 radius 的验证发生在 cylinderVolume 现在但在重构之后这可能会改变。如果你想确保不会出现这种回归，你应该测试 radius 对 cylinderVolume.

的验证

python 调用其他方法的单元测试方法

python unittest methods which call other methods

python

tdd

unit-testing