Javascript scripting tooling

I'm looking to develop a Javascript function relating to this thread https://community.adobe.com/t5/acrobat/acrobat-javascript-extracting-footnotes-technique/m-p/10753722) and I've spent a while trying to figure out how all the tooling works inside Acrobat.

When I click on the Javascript tool I'm presented with a toolbar with options such as Debug | Debugger | Document Javascripts etc. When I click on Document Javascripts I'm able to add one e.g.

function test()
{
    return 1+1
}

and the only way I can figure out how to run it is:

1. Close the "Document Javascripts" Window 
2. Click on "Debugger" on the toolbar
3. Select the script "test"
4. Change the view to "Console" below
5. In the console type in "test()" so that it executes
6. Hit ctrl+enter

This seems like an excessive amount of steps that must be repeated to develop a script. Is there a better way?

Further, I can't seem to see anywhere where I can save "global" scripts that I can re-use on multiple PDFs. Is this possible to do?