test updates

- update main love readme to include note on tests
- added module tests for Sensor, Keyboard, Touch, Joystick, Mouse, and Love (for hooks + basic love-level methods)
- general clean-up of main class logic
- couple fixes for runner-specific failures (physics.Joint, audio.getActiveSourceCount, mouse.getPosition)
- change window.close test to run last

readme.md

@@ -29,6 +29,16 @@ There are also unstable/nightly builds:
 - For ubuntu linux they are in [ppa:bartbes/love-unstable][unstableppa]
 - For arch linux there's [love-git][aur] in the AUR.
 
+Test Suite
+----------
+
+The test suite in `testing/` covers all the LÖVE APIs, and tests them the same way developers use them. You can view current test coverage from any [12.0-dev action][12devworkflows].  
+You can run the suite locally like you would run a normal LÖVE project, i.e.:  
+`love testing/main.lua`
+
+See the [readme][testsuite] in the testing folder for more info.  
+You can contribute to the test suite [here][testsuitemain]
+
 Contributing
 ------------
 
@@ -107,3 +117,6 @@ Dependencies
 [codestyle]: https://love2d.org/wiki/Code_Style
 [android-repository]: https://github.com/love2d/love-android
 [releases]: https://github.com/love2d/love/releases
+[testsuite]: https://github.com/love2d/love/tree/12.0-development/testing
+[testsuitemain]: https://github.com/ellraiser/love-test
+[12devworkflows]: https://github.com/love2d/love/actions/workflows/main.yml?query=branch%3A12.0-development