request causes doctest to fail

[ftnext]

Congrats on the release of Flask 2.2.0🎉

I noticed some weird behavior.

Environment:

• Python version: 3.8.6
• Flask version: 2.2.0
• nose 1.3.7

Procedure:

1. Create the following file as example.py

from flask import request


def awesome_function():
    return "spam"

2. Run nosetests with doctests

$ nosetests --with-doctest -v

AS IS: nosetests fail

Failure: RuntimeError (Working outside of request context.

This typically means that you attempted to use functionality that needed
an active HTTP request. Consult the documentation on testing for
information about how to avoid this problem.) ... ERROR

======================================================================
ERROR: Failure: RuntimeError (Working outside of request context.

This typically means that you attempted to use functionality that needed
an active HTTP request. Consult the documentation on testing for
information about how to avoid this problem.)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/.../venv/lib/python3.8/site-packages/nose/failure.py", line 39, in runTest
    raise self.exc_val.with_traceback(self.tb)
  File "/Users/.../venv/lib/python3.8/site-packages/nose/plugins/manager.py", line 154, in generate
    for r in result:
  File "/Users/.../venv/lib/python3.8/site-packages/nose/plugins/doctests.py", line 228, in loadTestsFromModule
    tests = self.finder.find(module)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/doctest.py", line 939, in find
    self._find(tests, obj, name, module, source_lines, globs, {})
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/doctest.py", line 998, in _find
    if ((inspect.isroutine(inspect.unwrap(val))
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/inspect.py", line 520, in unwrap
    while _is_wrapper(func):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/inspect.py", line 511, in _is_wrapper
    return hasattr(f, '__wrapped__')
  File "/Users/.../venv/lib/python3.8/site-packages/werkzeug/local.py", line 316, in __get__
    obj = instance._get_current_object()  # type: ignore[misc]
  File "/Users/.../venv/lib/python3.8/site-packages/werkzeug/local.py", line 509, in _get_current_object
    raise RuntimeError(unbound_message) from None
RuntimeError: Working outside of request context.

This typically means that you attempted to use functionality that needed
an active HTTP request. Consult the documentation on testing for
information about how to avoid this problem.

----------------------------------------------------------------------
Ran 1 test in 0.107s

FAILED (errors=1)

TO BE: nosetests do NOT fail (0 tests run)

• In procedure 1, implementing some doctests do not change the result.

Workaround: pip install -U 'flask<2.2' (installed flask 2.1.3)

$ nosetests --with-doctest -v

----------------------------------------------------------------------
Ran 0 tests in 0.096s

OK

---

Flask 2.1.3 does not raise the error.
Is this a bug embedded in the upgrade to 2.2.0?

I was wondering if it would be better to write it in the nose repository,
but I think from frask import request is the cause, so I'll share it here.

[davidism]

Duplicate of pallets/werkzeug#2485. This is a longstanding issue with doctest/inspect and anything else that unconditionally tries to access attributes on global objects.