refactor: replace Logger with RunLogger and streamline logging setup

tests/environment/test_system.py

@@ -0,0 +1,24 @@
+from diceplayer.environment import Molecule, System
+
+import unittest
+
+
+class TestSystem(unittest.TestCase):
+    def test_class_instantiation(self):
+        system = System()
+
+        self.assertIsInstance(system, System)
+
+    def test_add_type(self):
+        system = System()
+        system.add_type(Molecule("test"))
+
+        self.assertIsInstance(system.molecule, list)
+
+        with self.assertRaises(TypeError) as ex:
+            system.add_type("test")
+            self.assertEqual(ex.exception, "Error: molecule is not a Molecule instance")
+
+
+if __name__ == "__main__":
+    unittest.main()