[Django] #33278: Use a custom exception type with django.test.testcases._DatabaseFailure

[Django]

#33278: Use a custom exception type with django.test.testcases._DatabaseFailure
------------------------------------------------+------------------------
               Reporter:  Daniel Hahler         |          Owner:  nobody
                   Type:  Cleanup/optimization  |         Status:  new
              Component:  Testing framework     |        Version:  3.2
               Severity:  Normal                |       Keywords:
           Triage Stage:  Unreviewed            |      Has patch:  0
    Needs documentation:  0                     |    Needs tests:  0
Patch needs improvement:  0                     |  Easy pickings:  0
                  UI/UX:  0                     |
------------------------------------------------+------------------------
 Currently an `AssertionError` with a message is used in case of blocked DB
 operations:
 {{{
 class _DatabaseFailure:
     def __init__(self, wrapped, message):
         self.wrapped = wrapped
         self.message = message

     def __call__(self):
         raise AssertionError(self.message)
 }}}
 
([https://github.com/django/django/blob/dfa1145a22042dcf9e504a5a7edd5557e3e0d07c/django/test/testcases.py#L142-L148
 source])

 Using a custom/distinctive exception type would allow for better catching
 and handling of this.
 Currently you would have to parse its {{{message}}} and/or look at the
 stack trace to see if it's this specific error, or a "normal" assertion
 error from a test.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/33278>
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