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我正在使用 Hapi.JS 和 Mongoose 编写 API。我正在使用测试数据库进行集成测试。但我发现，如果我在多个描述块之后清除数据库，则会对我在后续描述块中保存和运行查询的能力产生负面影响。我将在下面留下一些带注释的代码。

如何在每次测试后清除数据库并且没有任何影响其他测试的竞争条件？

'use strict'

//this test will pass when run alone
// it clears the db at the end of it's run

let testConfig = require('../fixtures/fixtures.js')
let User = require('../../models/user.js')
let Bucket = require('../../models/bucket.js')
let BucketFactory = require('../../factories/bucket-factory.js')
let request = require('request')
let bluebird = require('bluebird')
let mongoose = require('mongoose')
mongoose.Promise = bluebird


describe('Buckets API', function() {

    it('should get all buckets', function(done){
        request.get(`${testConfig.testConfig.testUrl}/buckets`, (err, response, body)=>{
            if (err){ throw new Error(err)}
            expect(response.statusCode).toBe(200)
            done()
        })
    })

    it('should get a bucket by its id', function (done) {
        request.get(`${testConfig.testConfig.testUrl}/buckets/${mongoose.Types.ObjectId()}`, (err, response, body)=>{
            expect(response.statusCode).toBe(200)
            done()
        })
    });

    it('should post it', function (done) {
        let testBucket = {name: "Drill", userId: mongoose.Types.ObjectId()}
        request.post(`${testConfig.testConfig.testUrl}/buckets`, {json: testBucket}, (err, response, body)=>{
            if(err){ throw new Error(err)}
            expect(response.statusCode).toEqual(200)
            done()
        } )
    });
    // i dont need this afterEach
    // but for illustrative purposes it will mess up the latter test
    // which will pass if i run it by itself
    // but it shouldnt right?
    afterEach((done)=>{
        Bucket.remove({}).then(()=>{done()})
    })
})

describe('findByAndUpdate', function () {
    beforeEach((done)=>{
        // this factory creates and saves a bucket
        // i've verified this by checking the test database manually
        let newBucket = BucketFactory
        done()
    })
    it('should find and update', function (done) {
        Bucket.find({}).exec()
            .then((data)=>{
                request.put(`${testConfig.testConfig.testUrl}/buckets/${data._id}`, {json: {name: 'Marvel'}}, (err, response, body)=>{
                    if(err){ throw new Error(err)}
                    console.log(body)
                    expect(response.statusCode).toEqual(200)
                    done()
                } )
            })

    });

    afterEach((done)=>{
        Bucket.remove({}).then(()=>{done()})
    })
});
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