[英]Sinon stub out module's function from a middleware
Based on this question , I need to also make a test for a middleware which also uses the db-connection.js
file.基于这个问题,我还需要对也使用
db-connection.js
文件的中间件进行测试。 The middleware file will look like this:中间件文件将如下所示:
const dbConnection = require('./db-connection.js')
module.exports = function (...args) {
return async function (req, res, next) {
// somethin' somethin' ...
const dbClient = dbConnection.db
const docs = await dbClient.collection('test').find()
if (!docs) {
return next(Boom.forbidden())
}
}
}
, the database connection file do not change, which is: ,数据库连接文件不变,即:
const MongoClient = require('mongodb').MongoClient
const dbName = 'test'
const url = process.env.MONGO_URL
const client = new MongoClient(url, { useNewUrlParser: true,
useUnifiedTopology: true,
bufferMaxEntries: 0 // dont buffer querys when not connected
})
const init = () => {
return client.connect().then(() => {
logger.info(`mongdb db:${dbName} connected`)
const db = client.db(dbName)
})
}
/**
* @type {Connection}
*/
module.exports = {
init,
client,
get db () {
return client.db(dbName)
}
}
How the middleware works is by passing list of strings (that strings is roles), I have to query to the database and check whether there is a record of each roles.中间件的工作原理是通过传递字符串列表(字符串是角色),我必须查询数据库并检查是否有每个角色的记录。 If the record exists, I will return
next()
, while if the record does not exist, I will return next(Boom.forbidden())
(next function with a 403 status code from Boom module).如果记录存在,我将返回
next()
,而如果记录不存在,我将返回next(Boom.forbidden())
(下一个 function 带有来自 Boom 模块的 403 状态码)。
Given the details above, how does one make a test to test out the return value of the middleware if the record exists or not?鉴于以上细节,如果记录存在与否,如何进行测试以测试中间件的返回值? This means I have to assert the
next()
and next(Boom.forbidden)
to be exact.这意味着我必须准确地断言
next()
和next(Boom.forbidden)
。
Based on the answer .根据答案。 You can create stubs for the
req
, res
objects, and next
function.您可以为
req
、 res
对象和next
function 创建存根。
Eg( Doesn't run, but it should work. )例如(不运行,但它应该工作。 )
const sinon = require('sinon');
describe('a', () => {
afterEach(() => {
sinon.restore();
});
it('should find some docs', async () => {
process.env.MONGO_URL = 'mongodb://localhost:27017';
const a = require('./a');
const dbConnection = require('./db-connection.js');
const dbStub = {
collection: sinon.stub().returnsThis(),
find: sinon.stub(),
};
sinon.stub(dbConnection, 'db').get(() => dbStub);
const req = {};
const res = {};
const next = sinon.stub();
const actual = await a()(req, res, next);
sinon.assert.match(actual, true);
sinon.assert.calledWithExactly(dbStub.collection, 'test');
sinon.assert.calledOnce(dbStub.find);
sinon.assert.calledOnce(next);
});
});
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.