freeCodeCamp运动追踪器项目：GET接口参数测试未通过求助

我在完成freeCodeCamp的运动追踪器项目时，卡在了这个测试项：

你可以为GET /api/users/:_id/logs请求添加from、to和limit参数，以获取任意用户的部分日志。from和to为yyyy-mm-dd格式的日期，limit为指定返回日志数量的整数。

预期响应示例：

{
  "username": "fcc_test",
  "count": 1,
  "_id": "5fb5853f734231456ccb3b05",
  "log": [{
    "description": "test",
    "duration": 60,
    "date": "Mon Jan 01 1990"
  }]
}

我返回的结果和示例格式一致，但测试始终不通过。以下是我的数据库查询函数：

export const fetchExerciseLogs = async (
    userId: string,
    from?: string,
    to?: string,
    limit?: string
): Promise<FetchExerciseLogsResult | undefined> => {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const foundId: User | null = await UserModel.findById(userId)

    // using username to find exercises associated with it
    const exerciseQuery: exerciseQuery = {}
    if (foundId) {
        exerciseQuery.username = foundId.username;
    }

    // if there are request queries for date, add those to the query object
    if (from && to) {
        const fromDate = new Date(from);
        const toDate = new Date(to);
        exerciseQuery.date = { $gte: fromDate, $lte: toDate };
    }

    // if there is a limit query, change it to a number
    let limitNumber: number = 9999
    if (limit) {
        limitNumber = parseFloat(limit);
    }

    // find all exercises in the db that match the username and any date and/or limit queries
    const foundExercises = await ExerciseModel.find(exerciseQuery).limit(limitNumber).exec()

    let logArray: ExerciseDetails[] | undefined = foundExercises.map((exercise) => {
        return {
            description: exercise.description,
            duration: exercise.duration,
            date: exercise.date,
        };
    })
    // if there's a limit query - return log array no longer than the limit
    if (limitNumber) {
        logArray = logArray.slice(0, limitNumber + 1)
    }

    const numOfExercises: number = logArray.length;

    const exerciseLog: FetchExerciseLogsResult = {
        username: foundExercises[0]?.username || "no username found",
        count: numOfExercises,
        _id: userId,
        log: logArray.length > 0 ? logArray : []
    }
    return exerciseLog
};

我已经尝试把返回的log字段中“no logs found”替换为空数组，但测试还是不通过，希望有人能帮忙排查问题。

内容的提问来源于stack exchange，提问作者nic-ole