text: import subprocess
  
  import pytest
  
  from statsmodels.compat.platform import PLATFORM_WIN
  from statsmodels.compat.scipy import SCIPY_11
  
  
  def test_lazy_imports():
      # Check that when statsmodels.api is imported, matplotlib is _not_ imported
      cmd = ("import statsmodels.api as sm; "
             "import sys; "
             "mods = [x for x in sys.modules if 'matplotlib.pyplot' in x]; "
             "assert not mods, mods")
  
      # TODO: is there a cleaner way to do this import in an isolated environment
      pyexe = 'python3' if not PLATFORM_WIN else 'python'
      p = subprocess.Popen(pyexe + ' -c "' + cmd + '"',
                           shell=True, close_fds=True)
      p.wait()
      rc = p.returncode
      assert rc == 0
  
  
  @pytest.mark.skipif(SCIPY_11, reason='SciPy raises on -OO')
  def test_docstring_optimization_compat():
      # GH#5235 check that importing with stripped docstrings doesn't raise
      p = subprocess.Popen('python -OO -c "import statsmodels.api as sm"',
                           shell=True,
                           stdout=subprocess.PIPE, stderr=subprocess.PIPE)
      out = p.communicate()
      rc = p.returncode
      assert rc == 0, out
  