我尝试为快速中间件功能设置存根伪造，而不是替换它。
我试图通过callsFake函数使用sinon stubbing，正如它从他们最新的文档中建议的那样。
即使我需要模块并在导出时替换属性。我一直在看原始的功能行为。
我知道我应该尝试在中间件函数设置之前获取该函数，并且这是在首次导入表达app时。
这是我试图存根的函数，定义为函数并导出为对象。它在脚本文件中定义，其路径类似于api/middlewares/stripe/signature。
const stripeHelper = require('../../../lib/stripe')
const logger = require('../../../lib/logger')
const verifySignature = (req, res, next) => {
var event
let eventName = req.url.replace('/', '')
try {
// Try adding the Event as `request.event`
event = stripeHelper.signatureCheck(
eventName,
req.body,
req.headers['stripe-signature']
)
} catch (e) {
// If `constructEvent` throws an error, respond with the message and return.
logger.error('Error while verifying webhook request signature', e.message, e)
return res.status(400).send('Webhook Error:' + e.message)
}
req.event = event
next()
}
module.exports.verifySignature = verifySignature
beforEach钩子以组织我的存根和前提条件或测试这是我的存根和测试挂钩设置：
const chai = require('chai')
const chaiHttp = require('chai-http')
const dirtyChai = require('dirty-chai')
const sinon = require('sinon')
const decache = require('decache')
const signatureMiddleware = require('../../../api/middlewares/stripe/signature')
const bp = require('body-parser')
let verifySignatureStub, rawStub
chai.should()
chai.use(dirtyChai)
chai.use(chaiHttp)
const API_BASE = '/api/subscriptions'
const planId = 'NYA-RUST-MONTHLY'
const utils = require('../../utils')
const {
hooks: {createSubscription, emitPaymentSucceeded},
stripe: {generateEventFromMock}
} = utils
let testUser, testToken, testSubscription, server
describe.only('Subscriptions renewal (invoice.payment_succeeded)', function () {
this.timeout(30000)
beforeEach(function (done) {
createSubscription(server, {planId}, function (err, resp) {
if (err) return done(err)
const {user, jwt, subscription} = resp
console.log(user, jwt)
testUser = user
testToken = jwt
testSubscription = subscription
done()
})
})
beforeEach(function (done) {
verifySignatureStub = sinon.stub(signatureMiddleware, 'verifySignature')
rawStub = sinon.stub(bp, 'raw')
rawStub.callsFake(function (req, res, next) {
console.log('bp raw')
return next()
})
verifySignatureStub.callsFake(function (req, res, next) {
const {customerId} = testUser.stripe
const subscriptionId = testSubscription.id
console.log('fake verify')
req.event = generateEventFromMock('invoice.payment_failed', {subscriptionId, customerId, planId})
return next()
})
done()
})
beforeEach(function (done) {
decache('../../../index')
server = require('../../../index')
const {customerId} = testUser.stripe
const {id: subscriptionId} = testSubscription
console.log(`emitting payment succeeded with ${customerId}, ${subscriptionId} ${planId}`)
emitPaymentSucceeded(server, testToken, function (err, response) {
if (err) return done(err)
done()
})
})
afterEach(function (done) {
verifySignatureStub.restore()
done()
})
it('Date subscription will renew gets set to a valid number roughly one month', function () {
// Not even getting here becasue calling the original function contains verifyMiddleware which should be replaced
})
it('Current period end is modified')
it('An invoice for the new starting period is generated')
it('Subscription status keeps active')
})
上下文（请填写以下信息）：
所有都在Node 8上运行，我正在使用mocha运行测试，并使用脏chai进行了设置。
这些是我的开发依赖项：
"devDependencies": {
"base64url": "^2.0.0",
"cross-env": "^5.0.5",
"decache": "^4.4.0",
"dirty-chai": "^2.0.1",
"faker": "^4.1.0",
"google-auth-library": "^0.12.0",
"googleapis": "^23.0.0",
"minimist": "^1.2.0",
"mocha": "^5.2.0",
"nodemon": "^1.12.0",
"nyc": "^11.2.1",
"sinon": "^6.1.5",
"standard": "^10.0.3",
"stripe-local": "^0.1.1"
}
根据经验，每个测试应设置存根，即在beforeEach或it，而不是在before。在这里，它们似乎不包含每个测试逻辑，但它们可以，并且在这种情况下，它们将不会像before那样按预期工作。 mocha-sinon应该最好用于将Mocha与Sinon沙箱集成，因此不需要afterEach来恢复存根，这是自动完成的。
由于verifySignature是导出属性而不是导出本身，因此signatureMiddleware模块可以保留原样，但是使用它的模块应该在需要使用verifySignature的测试中进行解除缓存并重新导入。如果整个测试套件的行为应该相同，那么也应该在beforeEach中执行。例如。如果直接在app模块中使用这些中间件，那就是：
const decache = require('decache');
...
describe(() => {
let app;
beforeEach(() => {
verifySignatureStub = sinon.stub(signatureMiddleware, 'verifySignature');
...
});
beforeEach(() => {
decache('./app');
app = require('./app');
});