Timeout when attempting to connect to mongo from jest unit tests

Jest-jasmine is different from Jasmine.
The syntax you used actually belongs to Jasmine 2.0+, not Jest-jasmine. So if you want to continue to use jest, you have to look into jest docs to find the answer.
Even more, "beforeAll" is not a standard jest injected variables, see jest api.

I got your code run with Jasmine 2.3.4, it runs just fine. I tried Promise/pit in jest to finish this job but failed.

First, install jasmine.

npm install -g jasminemkdir jasmine-test  cd jasmine-testjasmine initjasmine examplestouch spec/mongodbspec.js

Here is my directory structure:

fenqideMacBook-Pro:jasmine-test fenqi$ ls -R.:spec/./spec:mongodbspec.js  support/./spec/support:jasmine.json

Then, edit spec/mongodbspec.js, I just add one line " 'use strict'; " to your code.

'use strict';const mongoose = require('mongoose');describe('MyTest', () => {  beforeAll((done) => {    mongoose.connect('mongodb://127.0.0.1:27017/test');    let db = mongoose.connection;    db.on('error', (err) => {      done.fail(err);    });    db.once('open', () => {      done();    });  });  it('has some property', () => {    // should pass but actually never gets run    expect(1).toBe(1);  });});

Last, run 'jasmine' :

fenqideMacBook-Pro:jasmine-test fenqi$ jasmineStarted.1 spec, 0 failuresFinished in 0.023 seconds