def get_test_spots_image(spot_id=None):
    """
    returns a image from a repository of test images. If spot_id left None, it will return a random image from the repository.

    Parameters
    ----------
    spot_id :: (dictionary)
        dictionary from moments

    Returns
    -------
    eccentricity :: (float)

    Examples
    --------
    >>> spot_properties = get_spot_properties(m)
    """
