code: def test_line_graph():
      """Naive test to run the function without errors"""
      # Multiple graphs
      line_graph(
          values=[[1, 2, 3], [3, 2, 1]],
          labels=["Train", "Valid"],
          x_guides=[0, 1],
          x_name="Epoch",
          y_name="Accuracy",
          legend_loc="best",
      )
      assert plt.gca().get_xlabel() == "Epoch"
      assert plt.gca().get_ylabel() == "Accuracy"
      plt.close()
  
      # Single graph as a subplot
      line_graph(values=[1, 2, 3], labels="Train", subplot=(1, 1, 1))
      plt.close()
  
      # Single graph with x values
      line_graph(
          values=[(1, 1), (2, 2), (3, 3)],
          labels="Train",
          x_min_max=(0, 5),
          y_min_max=(0, 5),
          plot_size=(5, 5),
      )
      plt.close()
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_line_graph() without return types