fix(): E2E tests

[antennaio]

Problem:

Currently the only E2E test fails with the following error (yarn run test:e2e ):

expected 200 "OK", got 404 "Not Found"

Additionally, there’s an issue that is caused by the keepConnectionAlive TypeOrm module option.

Jest did not exit one second after the test run has completed.

This usually means that there are asynchronous operations that weren't stopped in your tests. Consider running Jest with --detectOpenHandles to troubleshoot this issue.

Solution:

• Add support for a separate database for tests
• Drop the schema and rebuild the tables on each run
• Disable keepConnectionAlive option when running tests
• Fix failing test, add a few more working examples

Fixes #16

[NarHakobyan]

Hi @antennaio, well done, thanks. :)