Add tests question to MR template

.gitlab/merge_request_templates/default.md

@@ -19,6 +19,11 @@
 <!-- - Bug fix (non-breaking change which fixes an issue) -->
 <!-- - New feature (non-breaking change which adds functionality) -->
 <!-- - Breaking change (fix or feature that would cause existing functionality to not work as expected) -->
+<!-- - Docs (changes to the documentation) -->
+<!-- - Style (formatting changes only, no code changes) -->
+<!-- - Refactor (refactoring code with no functionality changes) -->
+<!-- - Test (additional or refactored tests) -->
+<!-- - Chore (non-code changes, e.g. comments, readme, grammar, etc...) -->
 
 ## Checklist:
 <!--- Go over all the following points, and uncomment all lines that apply: -->
@@ -26,6 +31,7 @@
 <!-- - My code follows the code style of this project. -->
 <!-- - My change requires a change to the documentation. -->
 <!-- - I have updated the documentation accordingly. -->
+<!-- - I added tests where appropriate. -->
 
 ## Reviewers
 <!--- Tag a minimum of two reviewers -->