Replace existing integration tests (scripts) with new ones (using Ava).

[DavidVujic]

The goal is to run the integration tests in a Docker environment, and get proper test results.

Description

Replacing the existing test scripts with new ones using a test tool (ava).

Motivation and Context

The existing integration test scripts are difficult to understand if they have succeeded or failed. Some of them seems to have transient behaviour. This is an attempt to formalize the tests into "proper" ones using a test tool (ava) with assertions.

Long term, I want to run these integration tests in CircleCI (using Docker/Docker compose).

How Has This Been Tested?

npm test ✅
npm run lint ✅
npm run test-integration ✅
CircleCI ✅

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the code of conduct.
• I have read the contributing guide.
• I have updated the documentation accordingly (if applicable).