Do unit test and regression test #4

[ezrayst]

Supersede #24

[codecov]

Codecov Report

Merging #35 into develop will decrease coverage by 2.92%.
The diff coverage is 13.33%.

@@             Coverage Diff             @@
##           develop      #35      +/-   ##
===========================================
- Coverage    40.04%   37.11%   -2.93%     
===========================================
  Files           15       17       +2     
  Lines          432      493      +61     
===========================================
+ Hits           173      183      +10     
- Misses         259      310      +51

Impacted Files	Coverage Δ
tests/gmsh_test.cc	2% <2%> (ø)
tests/regression_test.cc	70% <70%> (ø)
include/mesh.h	0% <0%> (ø)	⬆️
include/element.h	16.66% <0%> (+16.66%)	⬆️

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[kks32]

Could this be passed as an argument? rename regression_test.msh to a more meaningful filename of the geometry you are modelling like cube_test.msh

[ezrayst]

I can change the name easily... as for the argument, I checked this: https://github.com/philsquared/Catch/blob/master/docs/own-main.md

Could you explain more on how to get this? I can't seem to add int main in regression_test.cc file

[ezrayst]

Have added the ability to parse an argument for regression test

Note that this is the way as it is still under development:
catchorg/Catch2#622

[kks32]

Could we rebase to develop?