即使答案相等，Django assertEquals（）测试失败 [英] Django assertEquals() test failing even though answer is equal

问题描述

我有一个功能：

from django.contrib.gis.measure import Distance, D

def RunLengthCalc(mod_ewdim, mod_ewspacing, cols):
    y = D(inch=mod_ewspacing)  # user input
    x = D(inch=mod_ewdim)  # user input
    z = D(inch=3)  # constant
    lrun = ((x * cols) + (y * (cols - 1))) + zrun
    return lrun

和我的测试：

def test_run_length_calculation(self):
    l = RunLengthCalc(26.5, 1, 25)
    self.assertEquals(l, D(inch=689.5))

但是当我运行测试我得到这个非常混乱的错误：

but when I run the test I get this very confusing error:

AssertionError: Distance(inch=689.5) != Distance(inch=689.5)

我无法解决问题在这里。

I can't work out what the problem is here.

任何帮助将不胜感激。

推荐答案

做一些有趣的事情，如何等距离等级实际上实现了：

There seems to be some funny business with how the Distance class equality is actually implemented:

https://github.com/django/django/blob/master/django/contrib/gis/measure.py#L87

阅读该代码，它看起来像你应该工作...但显然没有。

Reading that code, it looks like what you have should work... but apparently it doesn't.

我怀疑你可以解决你的问题比较如下所示的特定单位值：

I suspect you can fix your problem by comparing specific unit values like so:


self.assertEquals（l.inch，D（inch = 689.5）.inch）


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