Update unittests

[houpc]

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[codecov]

Codecov Report

Attention: Patch coverage is 98.77301% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.36%. Comparing base (d8eac3d) to head (55db846).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
MCintegration/integrators_test.py	98.09%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   90.59%   95.36%   +4.76%     
==========================================
  Files          10       10              
  Lines        1223     1359     +136     
==========================================
+ Hits         1108     1296     +188     
+ Misses        115       63      -52     

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