This feature pack seems incomplete

[sunnymints]

Firstly, I performed the installation process(pip install pybullet_planning), but the Python package only contains pybullet_planningwithout tests. And the documentation does not provide any explanation on how to install test, which can easily lead people to believe that the pip process has completed the installation of tests.
Secondly, I cloned the tests file from GitHub and ran two demos separately, which prompted that the module to close first was missing.
~/pybullet_planning/tests$ pytest -s -m motion_planning_2D --viewer
==================================== ERRORS ==================================== ___________________ ERROR collecting tests/test_cartesian.py ___________________ ImportError while importing test module '/home/jixiancheng/pybullet_planning/tests/test_cartesian.py'. Hint: make sure your test modules/packages have valid Python names. Traceback: /usr/lib/python3.8/importlib/__init__.py:127: in import_module return _bootstrap._gcd_import(name[level:], package, level) test_cartesian.py:21: in <module> import ikfast_kuka_kr6_r900 E ModuleNotFoundError: No module named 'ikfast_kuka_kr6_r900'

pytest -s -m collision_fn --viewer
___________________ ERROR collecting tests/test_cartesian.py ___________________ ImportError while importing test module '/home/jixiancheng/pybullet_planning/tests/test_cartesian.py'. Hint: make sure your test modules/packages have valid Python names. Traceback: /usr/lib/python3.8/importlib/__init__.py:127: in import_module return _bootstrap._gcd_import(name[level:], package, level) test_cartesian.py:21: in <module> import ikfast_kuka_kr6_r900 E ModuleNotFoundError: No module named 'ikfast_kuka_kr6_r900'