def METHOD_NAME(cls, parameter_set="default"):
    """Return testing parameter settings for the estimator.
    Parameters
    ----------
    parameter_set : str, default="default"
        Name of the set of test parameters to return, for use in tests. If no
        special parameters are defined for a value, will return `"default"` set.
    Returns
    -------
    params : dict or list of dict, default={}
        Parameters to create testing instances of the class.
        Each dict are parameters to construct an "interesting" test instance, i.e.,
        `MyClass(**params)` or `MyClass(**params[i])` creates a valid test instance.
        `create_test_instance` uses the first (or only) dictionary in `params`.
    """
    params = [{"strategy": x} for x in cls.VALID_STRATEGIES]
    for p in params:
        if p["strategy"] == "constant":
            p["constant"] = 0
    return params