5154 test fixes

[pipliggins]

Testing some pytest test fixes for #5191 without polluting the history

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Codecov Report

:x: Patch coverage is 99.53488% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 98.79%. Comparing base (4e891cb) to head (551b319).

Files with missing lines	Patch %	Lines
src/pybamm/solvers/base_solver.py	99.10%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5304      +/-   ##
===========================================
+ Coverage    98.77%   98.79%   +0.02%     
===========================================
  Files          321      321              
  Lines        27746    27733      -13     
===========================================
- Hits         27406    27400       -6     
+ Misses         340      333       -7     

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