code: def test_ssh_ipv4_6_incompatible():
      with assert_raises(SystemExit):
          main(
              ["datalad", "sshrun", "-4", "-6", "datalad-test", "true"]
          )
  
file_path: datalad/datalad/support/tests/test_sshrun.py
imports: import sys
  from io import StringIO, UnsupportedOperation
  import pytest
  from unittest.mock import patch
  from datalad.api import sshrun
  from datalad.cli.main import main
  from datalad.cmd import StdOutCapture, WitlessRunner
  from datalad.tests.utils_pytest import SkipTest, assert_equal, assert_raises, skip_if_on_windows, skip_ssh, swallow_outputs, with_tempfile
label_desc: Use image node_id 5 for calling a global function with example usage: test_ssh_ipv4_6_incompatible() without return types