Add todo to graph id test file

test/graph_id/test_graph_id.py

 """
 B-ASIC test suite for GraphID.
+
+TODO:
+- Split test cases into more functions.
+- Add docstrings to test cases.
 """
 
 from b_asic.graph_id import GraphID
@@ -7,6 +11,8 @@ from b_asic.graph_id import GraphID
 import pytest
 
 def test_create_graph_id():
+    """
+    Tests creation 
     graph_id = GraphID("add", 1)
 
     assert graph_id.graph_id_type == "add"