code: def _assert_best_trial(best_trial):
      """Verifies properties of the best trial"""
      assert best_trial["id"] == "7bbfdb8c684aa5f4be324a09d7da94af"
      assert best_trial["submitTime"] == "0001-01-01 00:00:00"
      assert best_trial["startTime"] == "0001-01-01 00:00:10"
      assert best_trial["endTime"] == "0001-01-02 00:00:00"
  
      parameters = best_trial["parameters"]
      assert len(parameters) == 1
      assert parameters["x"] == 10.0
  
      assert best_trial["objective"] == 0.05
  
      statistics = best_trial["statistics"]
      assert statistics["a"] == 10
      assert statistics["b"] == 5
  
imports: import copy
  import datetime
  from orion.core.worker.trial import Trial
label_desc: Use image node_id 4 for calling a global function with example usage: _assert_best_trial(best_trial) without return types