#27019: DiscoverRunner does not restore old settings.DEBUG value in teardown
-----------------------------------+--------------------
     Reporter:  cjerdonek          |      Owner:  nobody
         Type:  Bug                |     Status:  new
    Component:  Testing framework  |    Version:  1.10
     Severity:  Normal             |   Keywords:
 Triage Stage:  Unreviewed         |  Has patch:  0
Easy pickings:  0                  |      UI/UX:  0
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 `DiscoverRunner.teardown_test_environment()`
 
[https://github.com/django/django/blob/967aa7f6cc720b11e38b7e0cbeffc2c95c64fa05/django/test/runner.py#L529
 does not] restore the pre-test value of `settings.DEBUG`, as for example
 `test.utils.teardown_test_environment()` does for
 
[https://github.com/django/django/blob/967aa7f6cc720b11e38b7e0cbeffc2c95c64fa05/django/test/utils.py#L122
 the values it knows about].

 Since `test.utils`'s `setup_test_environment()` and
 `teardown_test_environment()` already have a pattern of storing and
 restoring environment values, I propose that this be addressed by adding a
 `debug` argument to `test.utils.setup_test_environment()` that
 `DiscoverRunner.setup_test_environment()` can then use.

 Alternatively, `test.utils.setup_test_environment()` could take
 responsibility for setting `DEBUG` to false.

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Ticket URL: <https://code.djangoproject.com/ticket/27019>
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