[WIP] tests: Prove that nested time solves is possible

[FabioLuporini]

fixes #640

time axis still broken but looks fixable with some extra work

[codecov[bot]]

Codecov Report

Merging #1881 (a03f14c) into master (6ab0949) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1881   +/-   ##
=======================================
  Coverage   89.56%   89.56%           
=======================================
  Files         210      210           
  Lines       35051    35061   +10     
  Branches     5295     5295           
=======================================
+ Hits        31393    31403   +10     
  Misses       3163     3163           
  Partials      495      495           

Impacted Files	Coverage Δ
tests/test_operator.py	97.81% <100.00%> (+0.02%)	:arrow_up:

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[FabioLuporini]

closing PR but the branch lives on