code: def test_system_ssh_version():
      try:
          WitlessRunner().run(["ssh", "-V"], protocol=StdOutErrCapture)
      except FileNotFoundError as exc:
          pytest.skip(f"no ssh binary available: {exc}")
      ev = ExternalVersions()
      assert ev["cmd:system-ssh"]
  
imports: import logging
  import pytest
  from os import linesep
  from datalad import __version__
  from datalad.cmd import StdOutErrCapture, WitlessRunner
  from datalad.support.annexrepo import AnnexRepo
  from datalad.support.exceptions import CommandError, MissingExternalDependency, OutdatedExternalDependency
  from datalad.tests.utils_pytest import SkipTest, assert_equal, assert_false, assert_greater, assert_greater_equal, assert_in, assert_not_in, assert_raises, assert_true, create_tree, patch, set_annex_version, swallow_logs, with_tempfile
  from ..external_versions import ExternalVersions, LooseVersion
label_desc: Use image node_id 14 for calling a global function with example usage: test_system_ssh_version() without return types