buildMemberMatcherShallowIncludesWithTiers = (tiersCount, newsletterCount) => {
    const matcher = {
        ...memberMatcherShallowIncludes
    };

    if (tiersCount !== undefined) {
        matcher.tiers = new Array(tiersCount).fill(tierMatcher);
    }

    if (newsletterCount !== undefined) {
        matcher.newsletters = new Array(newsletterCount).fill(newsletterSnapshot);
    }

    return matcher;
}
@param {number} tiersCount
@param {number} newsletterCount
@returns