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const request = require('supertest');
const express = require('express');
const app = express();
app.get('/user', function(req, res) {
res.status(200).json({ name: 'john' });
});
request(app)
.get('/user')
.expect('Content-Type', /json/)
.expect('Content-Length', '15')
.expect(200)
.end(function(err, res) {
if (err) throw err;
});