我有C和Fortran编程背景,但是我一直在尝试学习Python和面向对象。为了帮助我的某些项目,我一直在尝试定义一些其他的单元测试。
我已经使用了AssertAlmostEqual单元测试,但是我发现对于较大的数字,它不能很好地工作,因为它可以工作到7个小数位(我认为)。当测试大指数时,这变得毫无用处。因此,我尝试为有效数字而不是小数位定义一个assertEqualSigFig测试。该测试的灵感来自流程帖子上的堆栈,但是我找不到原始的帖子。
此测试适用于整数浮点数和布尔值,但是我想看看它是否也适用于复数。通过将数字分成实部和虚部,然后调用自身。发生这种情况时,不会引发断言错误,而且我不确定为什么。
这是我的代码:
import unittest
import math
class MyTestClass(unittest.TestCase):
"""
MyTestClass
Adds additional tests to the unit test module:
defines:
- AssertEqualSigFig
description:
- Used in place of the assertAlmostEqualTest, this tests two values
are the same to 7 significant figures (instead of decimal places)
args:
- any two integers, booleans, floats or complex number
returns:
- assertion error if not equal to defined significant figures
"""
def AssertEqualSigFig(self, expected, actual, sig_fig = 7):
if sig_fig < 1:
msg = "sig fig must be more than 1"
raise ValueError(msg)
try:
if isinstance(expected, bool):
if expected != actual:
raise AssertionError
else:
return
elif isinstance(expected, (int,float)):
pow_ex = int(math.floor(math.log(expected,10)))
pow_ac = int(math.floor(math.log(actual,10)))
tolerance = pow_ex - sig_fig + 1
tolerance = (10** tolerance)/2.0
if abs(expected - actual) > tolerance:
raise AssertionError
else:
return
elif isinstance(expected, complex):
#this part doesnt raise an error when it should
a_real = actual.real
a_imag = actual.imag
e_real = expected.real
e_imag = expected.imag
self.AssertEqualSigFig(self, a_imag, e_imag)
self.AssertEqualSigFig(self, a_real, e_real)
except AssertionError:
msg = "{0} ! = {1} to {2} sig fig".format(expected, actual, sig_fig)
raise AssertionError(msg)
当涉及复数时,该测试失败。这是失败的单元测试的单元测试:
import unittest
from MyTestClass import MyTestClass
class TestMyTestClass(MyTestClass):
def test_comlex_imag_NE(self):
a = complex(10,123455)
b = complex(10,123333)
self.assertRaises(AssertionError, self.AssertEqualSigFig, a, b)
def test_complex_real_NE(self):
a = complex(2222222,10)
b = complex(1111111,10)
self.assertRaises(AssertionError, self.AssertEqualSigFig, a, b)
if __name__ == "__main__":
unittest.main()
我认为这是因为self.AssertEqualSigFig调用不会引发错误。我敢肯定我错过了一件愚蠢的事情,但是我仍在学习。有人可以帮忙吗?
答案 0 :(得分:0)
我是个白痴,我找到了解决方法
我应该一直在使用
MyTestClass.assertEqualSigFig
而不是
self.assertEqualSigFig