code: def test_can_add_same_edge():
      graph = DiGraph()
      graph.add_node("A")
      graph.add_node("B")
      graph.add_edge("A", "B")
      graph.add_edge("A", "B")
  
file_path: baikal/tests/_core/test_digraph.py
imports: import pytest
  from baikal._core.digraph import DiGraph, NodeNotFoundError, CyclicDiGraphError
label_desc: Use image node_id 6 for calling a global function with example usage: test_can_add_same_edge() without return types