How the test can be simpler? It is already simple.

You ca use pathlib_resolve_test.py but replace `os.symlink('.', 'testdir/0')` by `os.symlink(os.path.abspath('testdir'), 'testdir/0')`. Or use following shell commands:

mkdir testdir
for i in $(seq 100); do ln -s $((i-1))/$((i-1)) testdir/$i; done
ln -s "$(pwd)/testdir" testdir/0

./python -c "import pathlib; print(pathlib.Path('testdir/100').resolve())"