def docker_environment(env):
    """
    Transform dictionary of environment variables into Docker -e parameters.

    >>> result = docker_environment({'param1': 'val1', 'param2': 'val2'})
    >>> result in ["-e 'param1=val1' -e 'param2=val2'", "-e 'param2=val2' -e 'param1=val1'"]
    True
    """
    return ' '.join(["-e '%s=%s'" % (key, value) for key, value in env.items()])