docstr: Add the test validation subparser: manage.py test classifier [options]
code: def _setup_test_classifier_subparser(cls, subparsers):
      """Add the test validation subparser: manage.py test classifier [options]"""
      test_validate_parser = generate_subparser(
          subparsers,
          "classifier",
          description="Validate defined log schemas using integration test files",
          subcommand=True,
      )
  
      cls._add_default_test_args(test_validate_parser)
  
imports: import argparse
  import os
  import jmespath
  from mock import patch, MagicMock
  from streamalert.alert_processor import main
  from streamalert.alert_processor.helpers import compose_alert
  from streamalert.alert_processor.outputs.output_base import OutputDispatcher
  from streamalert.classifier import classifier
  from streamalert.rules_engine import rules_engine
  from streamalert.shared import rule
  from streamalert.shared.config import ConfigError
  from streamalert.shared.logger import get_logger
  from streamalert.shared.stats import RuleStatisticTracker
  from streamalert_cli.helpers import check_credentials
  from streamalert_cli.test.format import format_green, format_red, format_underline, format_yellow
  from streamalert_cli.test.mocks import LookupTableMocks, ThreatIntelMocks
  from streamalert_cli.test.event_file import TestEventFile
  from streamalert_cli.utils import CLICommand, DirectoryType, generate_subparser, UniqueSortedFileListAction, UniqueSortedListAction
label_desc: Use image node_id 2 for calling the TestCommand obj's underlying member method code with example usage: obj._setup_test_classifier_subparser(cls, subparsers) without return types