refactor: update imports and switch to pytest for testing

diceplayer/__main__.py

@@ -1,12 +1,12 @@
-import yaml
-
 from diceplayer.config.player_config import PlayerConfig
 from diceplayer.logger import logger
+from diceplayer.player import Player
+
+import yaml
 
 import argparse
 from importlib import metadata
 
-from diceplayer.player import Player
 
 VERSION = metadata.version("diceplayer")
 

diceplayer/environment/molecule.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
-from diceplayer.logger import logger
 from diceplayer.environment import Atom
+from diceplayer.logger import logger
 from diceplayer.utils.cache import invalidate_computed_properties
 from diceplayer.utils.misc import BOHR2ANG, EA_2_DEBYE
 from diceplayer.utils.ptable import GHOST_NUMBER

diceplayer/utils/logger.py

@@ -1,7 +1,9 @@
+from typing_extensions import TypeVar
+
 import logging
 import sys
 from pathlib import Path
-from typing_extensions import TypeVar
+
 
 H = TypeVar('H', bound=logging.Handler)