code: def test_validate(self):
      kwargs = {
          "project": None,
          "id": "abc123",
          "created": datetime.datetime.utcnow(),
          "user": "ben",
          "host": "",
          "config": {},
          "command": "",
      }
  
      experiment = Experiment(path=None, params="lol", **kwargs)
      assert experiment._validate() == ["params must be a dictionary"]
  
      experiment = Experiment(
          path=None, params={"foo": Blah()}, **kwargs
      )
      assert (
          "Failed to serialize the param 'foo' to JSON"
          in experiment._validate()[0]
      )
  
      experiment = Experiment(path="..", **kwargs)
      assert (
          "The path passed to the experiment must not start with '..' or '/'."
          in experiment._validate()[0]
      )
      experiment = Experiment(path="/", **kwargs)
      assert (
          "The path passed to the experiment must not start with '..' or '/'."
          in experiment._validate()[0]
      )
      experiment = Experiment(path="blah", **kwargs)
      assert (
          "The path passed to the experiment does not exist: blah"
          in experiment._validate()[0]
      )
  
imports: import math
  import datetime
  import json
  import os
  import pytest
  import tarfile
  import tempfile
  import time
  from pathlib import Path
  from unittest.mock import patch
  from waiting import wait
  import keepsake
  from keepsake.exceptions import DoesNotExist, ConfigNotFound, IncompatibleRepositoryVersion
  from keepsake.experiment import Experiment, ExperimentList
  from keepsake.project import Project
  from keepsake.metadata import rfc3339_datetime
  from tests.factories import experiment_factory, checkpoint_factory
label_desc: Use image node_id 1 for calling the TestExperiment obj's underlying member method code with example usage: obj.test_validate() without return types