code: def test_new():
      tracker = SQLiteTracker(":memory:")
      assert isinstance(tracker.new(), str)
  
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 2 for calling a global function with example usage: test_new() without return types