Improve test coverage

[superstar54]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.13861% with 28 lines in your changes missing coverage. Please review.

Project coverage is 85.89%. Comparing base (512d1a8) to head (ab113c1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/test_action.py	70.45%	13 Missing ⚠️
tests/utils/test_workchain.py	59.37%	13 Missing ⚠️
aiida_workgraph/engine/task_manager.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
+ Coverage   81.59%   85.89%   +4.29%     
==========================================
  Files          65       70       +5     
  Lines        4896     4927      +31     
==========================================
+ Hits         3995     4232     +237     
+ Misses        901      695     -206     

Flag	Coverage Δ
python-3.11	85.83% <86.13%> (+4.29%)	⬆️
python-3.12	85.83% <86.13%> (+4.29%)	⬆️
python-3.9	85.89% <86.13%> (+4.29%)	⬆️

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