code: def test_list_possible_issue_types(registry):
      lab = Datalab(data=[], label_name=None)
      issue_types = lab.list_possible_issue_types()
      assert isinstance(issue_types, list)
      possible_issues = [
          "outlier",
          "near_duplicate",
          "non_iid",
          "label",
          "class_imbalance",
          "underperforming_group",
          "data_valuation",
          "null",
      ]
      assert set(issue_types) == set(possible_issues)
  
      test_key = "test_for_list_possible_issue_types"
  
      class TestIssueManager(IssueManager):
          issue_name = test_key
  
      TestIssueManager = register(TestIssueManager)
  
      issue_types = lab.list_possible_issue_types()
      assert set(issue_types) == set(
          possible_issues + [test_key]
      ), "New issue type should be added to the list"
  
      # Clean up
      del registry["classification"][test_key]
  
imports: import pytest
  from cleanlab.datalab.internal.issue_manager_factory import register, REGISTRY
  from cleanlab import Datalab
  from cleanlab.datalab.internal.issue_manager.issue_manager import IssueManager
label_desc: Use image node_id 2 for calling a global function with example usage: test_list_possible_issue_types(registry) without return types