[Answer]-Django assertEquals() test failing even though answer is equal

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

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

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

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

[Answer]-Optional foreign key in model related to a model which doesn't exist