tests: fix promise left hanging after unit tests finish

[pedroferreira1]

Context

Issue: #292

The following log was found during unit tests

Jest has detected the following 1 open handle potentially keeping Jest from exiting:

  ●  TCPSERVERWRAP

... 

  at Test.Object.<anonymous>.Test.serverAddress (node_modules/supertest/lib/test.js:59:33)
      at new Test (node_modules/supertest/lib/test.js:36:12)
      at Object.obj.(anonymous function) [as get] (node_modules/supertest/index.js:25:14)

Checking this issue one of the possibilities was that the supertest server was not being closed after the test.

I used the solution proposed here

Acceptance Criteria

• Close open promises after unit test end
• I decided to keep forceExit parameter for a while to understand if there could be other hanging places.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

Merging #306 (42894f1) into dev (4a8f508) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #306   +/-   ##
=======================================
  Coverage   86.98%   86.98%           
=======================================
  Files          35       35           
  Lines        1352     1352           
  Branches      269      269           
=======================================
  Hits         1176     1176           
  Misses        155      155           
  Partials       21       21