def ppi_params_and_ref(request):
    """
    Fixture that applies the PointsPerIntervalSlicer to the prepared test case.

    Parameters
    ----------
    request : tuple
        Prepared test case for PointsPerIntervalSlicer.

    Returns
    -------
    dict
        Characteristics of interval.

    """

    params = request.param[0]
    references = request.param[1]
    intervals = request.param[2]
    boundaries = request.param[3]
    return {
        "params": params,
        "references": references,
        "intervals": intervals,
        "boundaries": boundaries,
    }