How to check for instantiation of a python class during unit-tests

Question

I for the life of me can not remember how to test for the instination of a python class.

It was something like:

try:
  m = MyModel()
except:
  ...

I can't remember the exception to call or the assert to use.

Answer 1

There is no common exception to use for failed instantiation. The constructor (both __init__ and __new__) can raise any exception it wants. The except statement you have without an explicit exception will catch every type of exception, which may be what you want.