docstr: Test run_acc() when there are no valid records to choose from.
docstr_tok: ["Test","run_acc","(",")","when","there","are","no","valid","records","to","choose","from","."]
code: def test_run_acc_empty(self):
      """Test run_acc() when there are no valid records to choose from."""
      self.assertEqual(
          model_selection.OracleSelectionMethod.run_acc(Q([])), None
      )
  
imports: import argparse
  import itertools
  import json
  import os
  import subprocess
  import sys
  import time
  import unittest
  import uuid
  import torch
  from domainbed import model_selection
  from domainbed.lib.query import Q
  from parameterized import parameterized
label_desc: Use image node_id 3 for calling the TestOracleSelectionMethod obj's underlying member method code with example usage: obj.test_run_acc_empty() without return types