code: def assert_subprocess_call():
      """Run code, asserting that subprocess.Popen *is* called at least once."""
      with mock.patch("subprocess.Popen") as mock_Popen:
          yield
      mock_Popen.assert_called()
  
imports: import contextlib
  import datetime
  import unittest
  from unittest import mock
  import re
  from absl.testing import absltest
  import jax
  from jax._src.lib import check_jaxlib_version
  from jax._src import test_util
label_desc: Use image node_id 3 for calling a global function with example usage: assert_subprocess_call() without return types