1

我有这样的功能：

    static async performDatabaseConnectivityHealthCheck(logger) {

    let con;
    let ret;

    try {

        con = mysql.createConnection({
            host: config.db.host,
            user: config.db.user,
            password: config.db.password,
            database: config.db.db,
        });

        const { retData } = await sqlFileReader.read('./src/database/sql/healthcheck.sql', [config.db.db], con, logger);

        // Do something with retData.....

    }
    catch (error) {
        logger.error(error.message);
        throw error;
    }
    finally {
        if (con) {
            con.end();
        }
    }
    return ret;

}

像这样的测试：

    it('throws a \'Database Healthcheck Error\' error when the Database Healthcheck gives the wrong data', async () => {

//Some irrelevant details here including providing rars for rars.logger in the following...

    sandbox.stub(sqlFileReader, 'read').returns(Promise.reject(new Error("ER_PROCACCESS_DENIED_ERROR: execute command denied to user 'dchambers'@'%' for routine 'uk_txtloan.connection_ids'")));

    expect(async () => {
        await RiskAffordabilityReportService.performDatabaseConnectivityHealthCheck(rars.logger);
    }).to.throw('ER_PROCACCESS_DENIED_ERROR: execute command denied to user \'dchambers\'@\'%\' for routine \'uk_txtloan.connection_ids\'');

});

我有两个问题。首先，该sandbox.stub行给出了以下警告，我对此感到困惑，因为我要求 Promise 被拒绝！

UnhandledPromiseRejectionWarning: Error: ER_PROCACCESS_DENIED_ERROR: execute command denied to user 'dchambers'@'%' for routine 'uk_txtloan.connection_ids'

其次，测试没有通过：

AssertionError: expected [Function] to throw an error.

我主要想知道警告。我尝试了以下语法，它们给出了相同的错误：

sandbox.stub(sqlFileReader, 'read').throws(new Error("ER_PROCACCESS_DENIED_ERROR: execute command denied to user 'dchambers'@'%' for routine 'uk_txtloan.connection_ids'"));

sandbox.stub(sqlFileReader, 'read').resolves(Promise.reject(new Error("ER_PROCACCESS_DENIED_ERROR: execute command denied to user 'dchambers'@'%' for routine 'uk_txtloan.connection_ids'")));

sandbox.stub(sqlFileReader, 'read').rejects(new Error("ER_PROCACCESS_DENIED_ERROR: execute command denied to user 'dchambers'@'%' for routine 'uk_txtloan.connection_ids'"));

消除警告的正确方法是什么？奖励：使测试通过。

4

1 回答 1

1

Promise如果未处理拒绝的承诺，即未使用catch(...)or链接，则在最近的实现中会引发未处理的承诺拒绝错误then(..., ...)。

Chaito.throw断言用 包装了一个函数try..catch，但函数中没有抛出错误async。asyncfunction 是返回 promise 的函数的语法糖。函数内部未捕获的错误async会导致返回被拒绝的承诺。相反，它应该用 chai-as-promised 断言来断言：

expect(RiskAffordabilityReportService.performDatabaseConnectivityHealthCheck(rars.logger))
.to.be.rejectedWith(
  Error,
  'ER_PROCACCESS_DENIED_ERROR: execute command denied to user \'dchambers\'@\'%\' for routine \'uk_txtloan.connection_ids\''
);
于 2018-05-24T18:05:10.107 回答