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Sinon存根发出意外的未处理的PromiseRejection警告

chai-as-promised chai sinon node.js

Dave Chambers · 技术社区 · 8 年前

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, sandbox.stub 行给出了以下警告,我很困惑,因为我要求承诺被拒绝!

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 .

我主要想知道这个警告。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:通过考试。

1 回复 | 直到 8 年前

Estus Flask 8 年前

最近引发了未处理的承诺拒绝错误 Promise 未处理拒绝承诺的实现,即未与 catch(...) 或 then(..., ...) .

柴 to.throw 断言用包装函数 try..catch ,但未引发任何错误 async 功能。 异步的 函数是返回承诺的函数的语法糖。内部未捕获错误 异步的 函数导致返回被拒绝的承诺。相反,它应该作为承诺的断言与chai一起断言:

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\''
);