Replace some relative imports in tests

[opoplawski]

I was getting some errors in the tests about relative imports.

[corranwebster]

Thanks for the contribution.

There's probably many more relative imports in the codebase, but it usually isn't an issue. I'm curious what issue you were seeing, so we can avoid it in the future.

[opoplawski]

+ export PYTHONPATH=/home/orion/BUILDROOT/python-traitsui-7.4.3-3.fc38.x86_64/usr/lib/python3.11/site-packages
+ PYTHONPATH=/home/orion/BUILDROOT/python-traitsui-7.4.3-3.fc38.x86_64/usr/lib/python3.11/site-packages
+ export PYTHONUNBUFFERED=1
+ PYTHONUNBUFFERED=1
+ pushd build/lib/traitsui/tests/
~/fedora/python-traitsui/traitsui-7.4.3/build/lib/traitsui/tests ~/fedora/python-traitsui/traitsui-7.4.3
+ PYTHONPATH=/home/orion/BUILDROOT/python-traitsui-7.4.3-3.fc38.x86_64/usr/lib/python3.11/site-packages
+ xvfb-run /usr/bin/python3 -X faulthandler -W default -m unittest discover -v
/usr/lib64/python3.11/site-packages/traits/observation/_generated_parser.py:258: DeprecationWarning: module 'sre_parse' is deprecated
  import sre_parse
/usr/lib64/python3.11/site-packages/traits/observation/_generated_parser.py:259: DeprecationWarning: module 'sre_constants' is deprecated
  import sre_constants
/usr/lib64/python3.11/site-packages/shiboken2/files.dir/shibokensupport/feature.py:139: DeprecationWarning: the imp module is deprecated in favour of importlib and slated for removal in Python 3.12; see the module's documentation for alternative uses
  return original_import(name, *args, **kwargs)
...
ERROR: test_key_bindings (unittest.loader._FailedTest.test_key_bindings)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_key_bindings
Traceback (most recent call last):
  File "/usr/lib64/python3.11/unittest/loader.py", line 407, in _find_test_path
    module = self._get_module_from_name(name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 350, in _get_module_from_name
    __import__(name)
  File "/usr/lib64/python3.11/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orion/fedora/python-traitsui/traitsui-7.4.3/build/lib/traitsui/tests/test_key_bindings.py", line 17, in <module>
    from ..key_bindings import KeyBinding, KeyBindings, KeyBindingsHandler
  File "/usr/lib64/python3.11/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: attempted relative import with no known parent package


======================================================================
ERROR: test_view_application (unittest.loader._FailedTest.test_view_application)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_view_application
Traceback (most recent call last):
  File "/usr/lib64/python3.11/unittest/loader.py", line 407, in _find_test_path
    module = self._get_module_from_name(name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 350, in _get_module_from_name
    __import__(name)
  File "/usr/lib64/python3.11/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orion/fedora/python-traitsui/traitsui-7.4.3/build/lib/traitsui/tests/test_view_application.py", line 17, in <module>
    from ._tools import (
  File "/usr/lib64/python3.11/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: attempted relative import with no known parent package

[corranwebster]

Ah, it's under Python 3.11 - that's why we haven't been seeing it. We haven't yet really put any effort into fixing things for Python 3.11 - I know that there are some issues with Pyface, so this is likely not the only issue you'll see on 3.11, unfortunately.