code: def test_update_override():
      tracker = SQLiteTracker(":memory:")
      tracker.insert("uuid", dict(a=0, b=0))
      tracker.update("uuid", dict(a=1, b=2), allow_overwrite=True)
      res = tracker.get("uuid")
      assert res == dict(a=1, b=2)
  
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 7 for calling a global function with example usage: test_update_override() without return types