Fix broken test for utils.solver with symengine

[cdiener]

• fix failing test on newer sympy versions
• description of feature/fix
• tests added/passed
• add an entry to the next release

Minor change that repairs a broken test. Also, the logic of the test was a bit off and has now been corrected.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.09% 🎉

Comparison is base (e48bc84) 83.85% compared to head (19ba0fc) 83.94%.

❗ Current head 19ba0fc differs from pull request most recent head f5b8059. Consider uploading reports for the commit f5b8059 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1340      +/-   ##
==========================================
+ Coverage   83.85%   83.94%   +0.09%     
==========================================
  Files          66       66              
  Lines        5499     5499              
  Branches     1257     1257              
==========================================
+ Hits         4611     4616       +5     
+ Misses        572      567       -5     
  Partials      316      316              

see 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[cdiener]

Only affects symengine, apparently.

[Midnighter]

Thank you for the fix. I would at least change it to

fix_constraint = m.constraints[-1]

and then perform assertions on that.

[Midnighter]

Thanks for the changes.