Select: reduce test failure frequency

[dilpath]

closes #1183

[codecov-commenter]

Codecov Report

Attention: 396 lines in your changes are missing coverage. Please review.

Comparison is base (160c2a8) 88.16% compared to head (32961d1) 84.19%.
Report is 467 commits behind head on develop.

Files	Patch %	Lines
pypesto/ensemble/ensemble.py	69.36%	68 Missing ⚠️
...ypesto/hierarchical/spline_approximation/solver.py	83.68%	47 Missing ⚠️
pypesto/ensemble/util.py	65.13%	38 Missing ⚠️
pypesto/hierarchical/optimal_scaling/solver.py	93.53%	26 Missing ⚠️
pypesto/history/base.py	88.57%	24 Missing ⚠️
pypesto/hierarchical/petab.py	84.56%	23 Missing ⚠️
pypesto/engine/mpi_pool.py	0.00%	22 Missing ⚠️
pypesto/hierarchical/inner_calculator_collector.py	89.04%	16 Missing ⚠️
...pesto/hierarchical/spline_approximation/problem.py	89.18%	16 Missing ⚠️
pypesto/hierarchical/optimal_scaling/calculator.py	75.86%	14 Missing ⚠️
... and 19 more

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1240      +/-   ##
===========================================
- Coverage    88.16%   84.19%   -3.98%     
===========================================
  Files           79      148      +69     
  Lines         5257    11875    +6618     
===========================================
+ Hits          4635     9998    +5363     
- Misses         622     1877    +1255     

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[dweindl]

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