fix: make it easier to subclass runner

[frostming]

Signed-off-by: Frost Ming me@frostming.com

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.22%. Comparing base (7c95d33) to head (37f6001).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2872   +/-   ##
=======================================
  Coverage   85.21%   85.22%           
=======================================
  Files         106      106           
  Lines       10602    10603    +1     
  Branches     2304     2304           
=======================================
+ Hits         9035     9036    +1     
  Misses       1093     1093           
  Partials      474      474           

Flag	Coverage Δ
unittests	85.00% <100.00%> (+<0.01%)	⬆️

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