Split manifold tests

[dasoya]

Split manifold test into manifold_test, manifold_advanced_test, manifold_smooth_test, manifold_mingap_test.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.31741% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.27%. Comparing base (d437097) to head (b42123a). Report is 23 commits behind head on master.

Files	Patch %	Lines
test/smooth_test.cpp	98.41%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #800      +/-   ##
==========================================
- Coverage   91.84%   89.27%   -2.57%     
==========================================
  Files          37       61      +24     
  Lines        4976     8439    +3463     
  Branches        0      927     +927     
==========================================
+ Hits         4570     7534    +2964     
- Misses        406      905     +499     

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[elalish]

Thanks @dasoya and sorry that you didn't get into GSoC for this project - it would have been great to have you! Are you planning to come back to this PR, or should one of us take it over?

[dasoya]

Thanks @dasoya and sorry that you didn't get into GSoC for this project - it would have been great to have you! Are you planning to come back to this PR, or should one of us take it over?

Thank you for considering my proposal! I still want to contribute to this pr. I've been busy with exams the past few days, so I haven't been able to.. sorry!