code: def test_empty_help_param(pytester: Pytester) -> None:
      """Test that an empty help param is displayed correctly."""
      pytester.makeconftest(
          """
          def pytest_addoption(parser):
              parser.addini("test_ini", "", default=True, type="bool")
      """
      )
      result = pytester.runpytest("--help")
      assert result.ret == 0
      lines = [
          "  required_plugins (args):",
          "                        Plugins that must be present for pytest to run*",
          "  test_ini (bool):*",
          "Environment variables:",
      ]
      result.stdout.fnmatch_lines(lines, consecutive=True)
  
file_path: pytest/testing/test_helpconfig.py
imports: import pytest
  from _pytest.config import ExitCode
  from _pytest.pytester import Pytester
label_desc: Use image node_id 6 for calling a global function with example usage: test_empty_help_param(pytester) without return types