.send() send an empty body mocha node js - node.js

Question

I have an issue with the following code. The mocha .send() function send a body but it's empty when my api.js received it. When I do a request with PostMan it works, but when I use Mocha, it doesn't work.
api.js :
const express = require("express");
const dbConnection = require("../db/mysqlConnector.js");
const router = express();
const Validator = require('validatorjs');
// POST (Create)
router.post("/tasks", async function (req, res) {
try {
let validation = new Validator({
name: req.body.name,
description: req.body.description,
state: req.body.state,
priority: req.body.priority,
created_by: req.body.created_by
}, {
name: 'required|string',
description: 'required|string',
state: 'required|boolean',
priority: 'required|between:1,3',
created_by: 'required:number'
});
if (validation.fails()) { return res.status(400).json(); }
var con = await dbConnection();
await con.query('INSERT INTO `tasks` (name, description, state, priority, created_by) VALUES (?,?,?,?,?)',
[req.body.name, req.body.description, req.body.state, req.body.priority, req.body.created_by], function (error, results, fields) {
con.release();
res.status(201).json();
});
} catch (error) {
console.log(error);
}
});
test.js :
const chai = require("chai");
const request = require("supertest");
const expect = chai.expect;
const api = require("../routes/api.js");
const faker = require("faker");
describe("Tasks", function () {
describe("POST /tasks", function () {
it("should return 201 OK and insert a new task", async function () {
const response = await request(api)
.post("/tasks")
.send({
name: faker.vehicle.vehicle(),
description: faker.lorem.lines(3),
state: faker.datatype.boolean(),
priority: faker.datatype.number({min:1, max:3}),
created_by: faker.datatype.number({min:1, max:10})
})
.expect(201)
});
});
});
Am I missing something ?
Thanks