TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

[haavardw]

Broken with selenium 4.0.0.

Reproduced with python 3.8.10 and 3.9.5

File "xxxxxxxxxxxx/venv/lib/python3.8/site-packages/behave_webdriver/conditions.py", line 48, in <module>
   class element_is_selected(NegationMixin, EC.element_located_to_be_selected):
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

Reproducable by running package tests:

git/behave-webdriver$ python setup.py test
running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
writing behave_webdriver.egg-info/PKG-INFO
writing dependency_links to behave_webdriver.egg-info/dependency_links.txt
writing requirements to behave_webdriver.egg-info/requires.txt
writing top-level names to behave_webdriver.egg-info/top_level.txt
reading manifest file 'behave_webdriver.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'behave_webdriver.egg-info/SOURCES.txt'
running build_ext
behave_webdriver (unittest.loader._FailedTest) ... ERROR

======================================================================
ERROR: behave_webdriver (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: behave_webdriver
Traceback (most recent call last):
  File "/usr/lib/python3.8/unittest/loader.py", line 470, in _find_test_path
    package = self._get_module_from_name(name)
  File "/usr/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
    __import__(name)
  File "/home/haavardw/git/behave-webdriver/behave_webdriver/__init__.py", line 15, in <module>
    from behave_webdriver.driver import (Chrome,
  File "/home/haavardw/git/behave-webdriver/behave_webdriver/driver.py", line 18, in <module>
    from behave_webdriver.conditions import (element_is_present,
  File "/home/haavardw/git/behave-webdriver/behave_webdriver/conditions.py", line 48, in <module>
    class element_is_selected(NegationMixin, EC.element_located_to_be_selected):
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases


----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (errors=1)
Test failed: <unittest.runner.TextTestResult run=1 errors=1 failures=0>
error: Test failed: <unittest.runner.TextTestResult run=1 errors=1 failures=0>

[haavardw]

downgrading to selenium == 3.141.0 works around the issue

[kevin-pelago]

I'm also encountering this issue. downgrading selenium works for me too.

downgrading to selenium == 3.141.0 works around the issue

[haavardw]

selenium 4.0.0 was released yesterday and has changed EC.element_located_to_be_selected (and all the other classes in the same file) from being classes to functions, breaking the behave-webdriver pattern of inheritance and mixins.

[spyoungtech]

Thanks for tracking down the breaking change. I'll see if I can update the code to play nice in selenium 3.x and 4.x

For now, I've set selenium < 4 in the requirements (released oct 25 with v0.3.1).

[shayneoneill]

Whats the status on fixing this. Older versions of selenium seem to be incompatible with modern versions of URLLIB3 (urllib3 changed something to do with socket timeouts)

[spyoungtech]

Hi @shayneoneill I don't think I have a great answer for this right now. I'm not currently actively developing this project. I may find some time to take a closer look, but I can't make any promises right now.

I would be willing to review and accept pull requests for a fix, however, if someone else wants to take a stab at it.