#29024: `TestContextDecorator` never exits if `setUp` fails in tests
---------------------------------------------+------------------------
Reporter: Anthony King | Owner: nobody
Type: Bug | Status: new
Component: Testing framework | Version: 1.11
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
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when using `TestContextDecorator` as a class decorator, `enable` is called
just before `Test.setUp`, and `disable` is called after `Test.tearDown`.
unfortunately, `tearDown` is not called in the event of a failure inside
`setUp`. This can result in unexpected behaviour.
Even though this class is not documented, there are decorators that use it
that are.
example:
{{{#!python
class example_decorator(TestContextDecorator):
some_var = False
def enable(self):
self.__class__.some_var = True
def disable(self):
self.__class__.some_var = False
class Example1TestCase(TestCase):
def test_var_is_false(self):
# some_var will be False
self.assertFalse(example_decorator.some_var)
@example_decorator()
class Example2TestCase(TestCase):
def setUp(self):
raise Exception
def test_var_is_true(self):
# won't be hit due to exception in setUp
self.assertTrue(example_decorator.some_var)
class Example3TestCase(TestCase):
def test_var_is_false(self):
# some_var will be True now due to no cleanup in Example2TestCase
self.assertFalse(example_decorator.some_var)
}}}
output:
{{{
.EF
======================================================================
ERROR: test_var_is_true (sharefile.tests.Example2TestCase)
----------------------------------------------------------------------
... Traceback
======================================================================
FAIL: test_var_is_false (sharefile.tests.Example3TestCase)
----------------------------------------------------------------------
...
AssertionError: True is not false
Ran 3 tests in 0.007s
FAILED (failures=1, errors=1)
}}}
There are 2 potential fixes here:
- decorate `setUpClass` and `tearDownClass`
- use `addCleanup` inside the `setUp` decorator
`addCleanup` will always run, and will only ever be registered if the
context manager was successfully enabled.
It would also be useful to have this class documented, however that's out
of scope of this ticket.
--
Ticket URL: <https://code.djangoproject.com/ticket/29024>
Django <https://code.djangoproject.com/>
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