Today only testing is:

• manual sharing via GUI
• and by running from console: /run dsim2()

Fix more tests and put them in a new module.

Also document how to run them, and what needs to be run:

1. Before pushing to master
2. Before creating a release (e.g. real usage)

Fixed in 9126243, 2f6ca80, 6fafa2e.

This is first iteration on improving tests. More will be added with time.