Test with nonorthogonal hamiltonian

[tfrederiksen]

Following up on #888, what about also having a check for a nonorthogonal model and more intercell connections?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.82%. Comparing base (74134b4) to head (6ec5e37).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #889   +/-   ##
=======================================
  Coverage   86.82%   86.82%           
=======================================
  Files         405      405           
  Lines       53294    53308   +14     
=======================================
+ Hits        46272    46286   +14     
  Misses       7022     7022           

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[zerothi]

Thanks!