Problems with Mocha + Mongodb Edited

I have this little test:


const mongo = require('mongodb').MongoClient;

const dbString = 'mongodb://localhost:27017/tests';

describe("In mongodb", function () {
beforeEach(function (done) {
.then(function (currentDb) {
.catch(function (e) {

it('Empty test', function () {


And this little Bitbucket pipeline


image: node:6.9.4

- step:
- mongo
- npm install
- npm install -g mocha
- mocha

image: mongo


The problem is that the Mocha test never ends! I can see the end:


  1 passing (37ms) 


But the "mocha" action never ends in Bitbucket. In all our computers this works OK.

I found a solution closing the mongodb connection from the tests (i.e. using "after" and doing db.close for each mongo.connect), but I want to know why the behavior of this is different in pipelines and in our computers, and how to solve it without change our tests...



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