NameError: name 'QGISAPP' is not defined when using stop_app()

[jakimowb]

What is the bug or the crash?

The qgs.testing package provides the start_app and stop_app methods to run python tests.
However, stopping the QgsApplication raises an anyoing, but none-blocking NameError:

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "F:\OSGeo4W\apps\qgis-dev\python\qgis\testing\__init__.py", line 518, in exitQgis
    QGISAPP.exitQgis()
NameError: name 'QGISAPP' is not defined

Steps to reproduce the issue

Python code example:

from qgis.core import QgsApplication
from qgis.testing import start_app, stop_app

print(f'About to start: {QgsApplication.instance()}', flush=True)
start_app()
print(f'About to stop: {QgsApplication.instance()}', flush=True)
stop_app()
print(f'Stopped: {QgsApplication.instance()}', flush=True)

Versions

3.23.0-Master a9b522f (OSGeo4W)
3.23.0-Master 90f8c88 (Ubuntu)

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[elpaso]

Cannot reproduce on Linux/master:

In [1]: from qgis.core import QgsApplication
   ...: from qgis.testing import start_app, stop_app
   ...: 
   ...: print(f'About to start: {QgsApplication.instance()}', flush=True)
   ...: start_app()
   ...: print(f'About to stop: {QgsApplication.instance()}', flush=True)
   ...: stop_app()
   ...: print(f'Stopped: {QgsApplication.instance()}', flush=True)
About to start: None
../src/core/symbology/qgssymbollayerutils.cpp:1270 : (loadSymbol) [331ms] no layers for symbol
../src/core/symbology/qgssymbollayerutils.cpp:1270 : (loadSymbol) [1ms] no layers for symbol
../src/core/providers/qgsproviderregistry.cpp:329 : (init) [53ms] Loaded 24 providers (DB2;OAPIF;WFS;arcgisfeatureserver;arcgismapserver;delimitedtext;ept;gdal;geonode;gpx;mdal;memory;mesh_memory;mssql;ogr;oracle;postgres;postgresraster;spatialite;vectortile;virtual;virtualraster;wcs;wms) 
Application state:
QGIS_PREFIX_PATH env var:               /home/user/dev/QGIS/build-local-qt5152-release_gdal3/output
Prefix:
Plugin Path:            /home/user/dev/QGIS/build-local-qt5152-release_gdal3/output/lib/qgis/plugins
Package Data Path:      /home/user/dev/QGIS/build-local-qt5152-release_gdal3/output/data
Active Theme Name:
Active Theme Path:      /home/user/dev/QGIS/build-local-qt5152-release_gdal3/output/data/resources/themes//icons/
Default Theme Path:     :/images/themes/default/
SVG Search Paths:       /home/user/dev/QGIS/build-local-qt5152-release_gdal3/output/data/svg/
                /tmp/QGIS-PythonTestConfigPath6jgv6h4l/profiles/default/svg/
User DB Path:   /home/user/dev/QGIS/build-local-qt5152-release_gdal3/output/data/resources/qgis.db
Auth DB Path:   /home/user/tmp/qgis-auth.db

About to stop: <qgis._core.QgsApplication object at 0x7fec8eb22dc0>
Stopped: None

[jakimowb]

On my windows system it still occurs.
Interestingly the traceback printout got interrupted by the stdout Stopped: None

3.23.0-Master 50a68d40d7
About to start: None
Application state:
QGIS_PREFIX_PATH env var:		D:/OSGeo4W/apps/qgis-dev
Prefix:		D:/OSGeo4W/apps/qgis-dev
Plugin Path:		D:/OSGeo4W/apps/qgis-dev/plugins
Package Data Path:	D:/OSGeo4W/apps/qgis-dev/.
Active Theme Name:	
Active Theme Path:	D:/OSGeo4W/apps/qgis-dev/./resources/themes\\icons/
Default Theme Path:	:/images/themes/default/
SVG Search Paths:	D:/OSGeo4W/apps/qgis-dev/./svg/
		C:\Users\geo_beja\AppData\Local\Temp\QGIS-PythonTestConfigPath_koe8p7_\profiles\default/svg/
User DB Path:	D:/OSGeo4W/apps/qgis-dev/./resources/qgis.db
Auth DB Path:	C:\Users\geo_beja\AppData\Local\Temp\QGIS-PythonTestConfigPath_koe8p7_\profiles\default/qgis-auth.db

About to stop: <qgis._core.QgsApplication object at 0x0000025AAA833310>
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "D:\OSGeo4W\apps\qgis-dev\python\qgis\testing\__init__.py", line 518, in exitQgis
Stopped: None
    QGISAPP.exitQgis()
NameError: name 'QGISAPP' is not defined

Process finished with exit code 0

[github-actions]

The QGIS project highly values your report and would love to see it addressed. However, this issue has been left in feedback mode for the last 14 days and is being automatically marked as "stale".
If you would like to continue with this issue, please provide any missing information or answer any open questions. If you could resolve the issue yourself meanwhile, please leave a note for future readers with the same problem and close the issue.
In case you should have any uncertainty, please leave a comment and we will be happy to help you proceed with this issue.
If there is no further activity on this issue, it will be closed in a week.

[jakimowb]

@elpaso have you tried running it from an IDE like QtCreator?

# relates to https://github.com/qgis/QGIS/issues/46883

from qgis.core import QgsApplication, Qgis
from qgis.testing import start_app, stop_app
import unittest

print(Qgis.version(), Qgis.devVersion(), flush=True)


class TestQGISAPP(unittest.TestCase):

    def test_StartAndClose(self):
        print(f'About to start: {QgsApplication.instance()}', flush=True)
        start_app()
        print(f'About to stop: {QgsApplication.instance()}', flush=True)
        stop_app()
        print(f'Stopped: {QgsApplication.instance()}', flush=True)


if __name__ == '__main__':
    unittest.main()

Running this from QtCreator on Ubuntu still outputs the error. However, it's none-blocking, the test finishes well and I cannot figure out how to capture the NameError to let the unittest fail.

[github-actions]

The QGIS project highly values your report and would love to see it addressed. However, this issue has been left in feedback mode for the last 14 days and is being automatically marked as "stale".
If you would like to continue with this issue, please provide any missing information or answer any open questions. If you could resolve the issue yourself meanwhile, please leave a note for future readers with the same problem and close the issue.
In case you should have any uncertainty, please leave a comment and we will be happy to help you proceed with this issue.
If there is no further activity on this issue, it will be closed in a week.

[github-actions]

While we hate to see this happen, this issue has been automatically closed because it has not had any activity in the last 42 days despite being marked as feedback. If this issue should be reconsidered, please follow the guidelines in the previous comment and reopen this issue.
Or, if you have any further questions, there are also further support channels that can help you.