Python's unittest `assertCouldNotTest`? [closed]

Question

I am using Python's unittest module to do some testing that some probability density functions that I have implemented integrate to 1. To test this I am using Scipy's quad function:

integral, err = integrate.quad(my_pdf, -float('inf'), float('inf'))
self.assertTrue(isclose(integral, 1))

where isclose is from Python's math. For some PDFs it happens that err is > 1 and integral is "very far from 1" such as I would consider this a fail. However this is not a fail of my_pdf but a fail of the testing method. To avoid flagging this as a fail I can do

if err > 1:
    continue

but in this case I completely skipping this case without any clue that it happened.

Is it possible to somehow flag this kind of failure within unittest? Somthing like

if err > 1:
    self.couldNotTest()

such that in the end unittest will tell me the number of tests that could not be performed?