快递单元测试有柴错误=发送后无法设置标头

Question

TLDR：我的api可以很好地与curl和postman配合使用，但在一个put请求中使用chai-http时（所有其他put请求都可以工作），测试失败，出现错误“Cannot set headers after they are sent to the client”。我有一个针对我所有集合的通用更新方法（见下文），它适用于其他更新/放置请求。谢谢你的帮助。

摩卡

process.env.NODE_ENV = 'test';

const chai = require('chai');
const chaiHttp = require('chai-http');
const expect = chai.expect;
const c_paths = require('../constants/paths.js');
const app = require('../app.js');
chai.use(chaiHttp);

describe(c_paths.clients, () => {
it('It should create a new clients document', done => {
    let req = {
    test: true,
    data: [
        {
        name: 'client 1',
        contacts: [
            {
            name: 'client name 1',
            mobile: 'client mobile 1',
            email: '[e-mail]',
            },
        ],
        address: ['client address 1'],
        },
    ],
    };
    chai
    .request(app)
    .post(c_paths.clients)
    .send(req)
    .end((err, res) => {
        expect(res).to.have.status(200);
        expect(res.body.insertedCount).is.equal(
        1,
        'Number of inserted documents.',
        );
        expect(res.body.ops[0].name).is.equal(req.data[0].name);
        expect(res.body.ops[0].contacts[0].name).is.equal(
        req.data[0].contacts[0].name,
        );
        expect(res.body.ops[0].contacts[0].mobile).is.equal(
        req.data[0].contacts[0].mobile,
        );
        expect(res.body.ops[0].contacts[0].email).is.equal(
        req.data[0].contacts[0].email,
        );
        expect(res.body.ops[0].address[0]).is.equal(req.data[0].address[0]);
        expect(res.body.ops[0].pause_updates).is.false;
        expect(res.body.ops[0].pause_updates_toggle).is.false;
        done();
    });
});

it.('It should add a reccuring job', done => {
    let req = {
    test: true,
    filter: {
        name: 'client 1',
    },
    set: {
        recurring_jobs: [
        {
            job_id: 'job id 1',
            current_employee_id: 'employee id 1',
            employee_scheduled_till: 'Apr 30 2019',
            notes: ['note 1'],
            duties: ['duty 1'],
            repeat_in_days: 7,
            time: '11:00:00', // Validation error switched to 10000
            start_date: 'Mar 01 2019',
            end_date: 'May 30 2019',
            is_active: true,
        },
        ],
    },
    };
    chai
    .request(app)
    .put(c_paths.clients)
    .send(req)
    .end((err, res) => {
    expect(res).to.have.status(200);
    expect(res.body.ok).is.equal(1);
    done();
    }); 
});

it('It should delete one document', done => {
    let req = {
    test: true,
    filter: {
        name: 'client 1',
    },
    };
    chai
    .request(app)
    .delete(c_paths.clients)
    .send(req)
    .end((err, res) => {
        expect(res).to.have.status(200);
        expect(res.body.n).is.equal(1, 'Number of documents removed');
        done();
    });
});
});

在中更新方法。/routes/crud.js .第131行的错误是RES . status(200)send(result)；

function update(req, res, dbName, collectionName, joiSchema) {
var toValidate = '[';
var data = '{';
if (req.body.set) {
    toValidate = toValidate.concat(JSON.stringify(req.body.set), ',');
    data = data.concat('"$set":', JSON.stringify(req.body.set), ',');
}
if (req.body.inc) {
    toValidate = toValidate.concat(JSON.stringify(req.body.inc), ',');
    data = data.concat('"$inc":', JSON.stringify(req.body.inc), ',');
}
if (req.body.addToSet) {
    let temp = JSON.stringify(req.body.addToSet);
    temp = temp.replace('{"$each":[', '[');
    temp = temp.slice(0, -1); // Removes $each for validation
    toValidate = toValidate.concat(temp, ',');
    data = data.concat('"$addToSet":', JSON.stringify(req.body.addToSet), ',');
}
if (req.body.unset) {
    data = data.concat('"$unset":', JSON.stringify(req.body.unset), ',');
}
if (req.body.currentDate) {
    toValidate = toValidate.concat(JSON.stringify(req.body.currentDate), ',');
    data = data.concat(
    '"$currentDate":',
    JSON.stringify(req.body.currentDate),
    ',',
    );
}
if (req.body.rename) {
    data = data.concat('"$rename":', JSON.stringify(req.body.rename), ',');
}
if (req.body.pullAll) {
    toValidate = toValidate.concat(JSON.stringify(req.body.pullAll), ',');
    data = data.concat('"$pullAll":', JSON.stringify(req.body.pullAll), ',');
}
toValidate = toValidate.slice(0, -1); // Removes trailing comma
data = data.slice(0, -1);
toValidate = toValidate.concat(']');
data = data.concat('}');
Joi.validate(toValidate, joiSchema, function(err, value) {
    if (err) {
    res.send(err);
    return;
    }
});
MongoClient.connect(c_db.url, function(err, db) {
    if (err) {
    res.send(err);
    db.close();
    return;
    }
    const dbo = db.db(dbName);
    const filter = req.body.filter == null ? '' : req.body.filter;
    dbo
    .collection(collectionName)
    .updateMany(filter, JSON.parse(data), function(err, result) {
        if (err) {
        res.send(err);
        db.close();
        return;
        }
        res.status(200).send(result); //Error Line 131
        db.close();
    });
});
};

错误响应

错误[ERR_HTTP_HEADERS_SENT]：在将标头发送到ServerResponse处的客户端后，无法设置标头。ServerResponse上的setHeader（_http_outgoing.js:482:11）。ServerResponse上的header（./App/node_modules/express/lib/response.js:767:10）。在ServerResponse发送（./App/node_modules/express/lib/response.js:170:12）。ServerResponse上的json（./App/node_modules/express/lib/response.js:267:15）。发送（./App/node_modules/express/lib/response.js:158:21），位于./App/routes/crud。js:131:25在会话的结果（./App/node_modules/mongodb/lib/utils.js:414:17）。客户端会话的endSession（./App/node_modules/mongodb/lib/utils.js:401:11）。executeCallback（./App/node_modules/mongodb-core/lib/sessions.js:129:41）的endSession（./App/node_modules/mongodb/lib/utils.js:397:17）

Answer 1

这是一个Joi验证错误，为了解决它，我将JSON.stringify(req.body)添加到expect错误或console.log中，即expect(res.body.n，JSON . stringify(req . body)is . equal(1)；

这给了我在Mocha测试中的验证错误，一旦修复它就可以正常工作了。