import sys, os


def test_preimported_modules():
    lst = ['__builtin__', '_codecs', '_warnings', 'codecs', 'encodings',
           'exceptions', 'signal', 'sys', 'zipimport']
    if sys.platform == 'win32':
        cmd = '%s' % (sys.executable,)
    else:
        cmd = '"%s"' % (sys.executable,)
    g = os.popen(cmd + ' -c "import sys; print sorted(sys.modules)"')
    real_data = g.read()
    g.close()
    for name in lst:
        quoted_name = repr(name)
        assert quoted_name in real_data