[all] Update template pr

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,6 @@
 <!--
-Thank you very much for your pull request to the OpenAEV project! We as a community driven project depend on support and contributions like this!
+Thank you very much for your pull request to the OpenAEV project! We as a community
+driven project depend on support and contributions like this!
 
 Thus already a BIG THANK YOU upfront to you for choosing to help with your PR.
 -->
@@ -9,9 +10,14 @@ Thus already a BIG THANK YOU upfront to you for choosing to help with your PR.
 *
 *
 
+### Testing Instructions
+
+1. Step-by-step how to test
+2. Environment or config notes
+
 ### Related issues
 
-*
+* Closes #ISSUE-NUMBER
 *
 
 ### Checklist
@@ -23,13 +29,15 @@ By doing this, you are actively helping us to improve the quality of the entire
 -->
 
 - [ ] I consider the submitted work as finished
-- [ ] I tested the code for its functionality using different use cases
+- [ ] I tested the code for its functionality
+- [ ] I wrote test cases for the relevant uses case
 - [ ] I added/update the relevant documentation (either on github or on notion)
 - [ ] Where necessary I refactored code to improve the overall quality
 - [ ] For bug fix -> I implemented a test that covers the bug
 
+<!-- _NOTE: these things are not required to open a PR and can be done afterwards / while the PR draft is open._ -->
 <!-- For completed items, change [ ] to [x]. -->
 
 ### Further comments
 
-<!-- If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc... -->
+<!-- If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...-->