Fix python tests relative paths

[kunitoki]

This pull request updates the import system throughout the python/tests directory to simplify and standardize how test modules import shared utilities and the common module. The main change is to ensure that test files can use direct imports instead of relative imports by adding the test folder to sys.path at runtime. This improves compatibility and avoids import errors when running tests.

Key changes:

Import system modernization:

• Added logic to __init__.py and conftest.py to insert the test folder into sys.path if not already present. This allows for direct imports of modules like common and utilities from anywhere in the test suite. [1] [2]

Refactoring imports in test modules:

• Replaced all relative imports (e.g., from ..utilities import ...) with direct imports (e.g., from utilities import ...) in test files in test_yup_core, test_yup_events, and test_yup_graphics subdirectories. This includes updates in files such as test_File.py, test_FileFilter.py, test_FileOutputStream.py, test_JSON.py, test_TemporaryFile.py, test_XmlElement.py, and test_ZipFile.py. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

These changes make the test suite more robust and easier to maintain by eliminating fragile relative imports and ensuring consistent module resolution.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.87%. Comparing base (b7eee0c) to head (bc5c413).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   74.85%   74.87%   +0.02%     
==========================================
  Files         590      590              
  Lines       59209    59209              
==========================================
+ Hits        44319    44334      +15     
+ Misses      14890    14875      -15     

see 2 files with indirect coverage changes

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