WPT tests and test guidelines

The primary topic of the minutes of the last SVG WG meeting ( 
https://www.w3.org/2020/04/08-svg-minutes.html ) is the problem of 
finding people to implement tests and establishing guidelines for tests.

Meanwhile the vibe over at 
https://github.com/web-platform-tests/wpt/pull/22791 seems more like 
tolerant indifference (although I am very grateful for @fsoder's review).

So maybe some more dots could be connected between these? I am here, I 
have written some tests. I plan to write some more tests, and how many 
could depend on how much interest there is.

Skef