def test_shell(command):
    stdout, stderr, returncode = command.run('cat /proc/version')
    assert returncode == 0
    assert len(stdout) > 0
    assert len(stderr) == 0
    assert 'Linux' in stdout[0]

    stdout, stderr, returncode = command.run('false')
    assert returncode != 0
    assert len(stdout) == 0
    assert len(stderr) == 0