code: def test_experiment_comment():
      tracker = SQLiteTracker(":memory:")
      experiment = tracker.new_experiment()
      experiment.comment("some comment")
  
      df = tracker.query(
          """
  SELECT uuid,
         comment
  FROM experiments
  WHERE comment IS NOT NULL
  LIMIT 1
  """
      )
  
      assert df.to_dict() == {
          "comment": {experiment.uuid: "some comment"}
      }
      assert len(tracker) == 1
  
imports: import json
  from uuid import uuid4
  import time
  import pytest
  from sklearn_evaluation.tracker import SQLiteTracker
  from sklearn_evaluation import tracker
  from sklearn_evaluation import plot
label_desc: Use image node_id 24 for calling a global function with example usage: test_experiment_comment() without return types