Split test macro to separate file

[jishnub]

This makes tests simpler, as we may include test/testutils.jl before including a test file.

[codecov]

Codecov Report

Base: 64.91% // Head: 69.02% // Increases project coverage by +4.10% 🎉

Coverage data is based on head (32a9138) compared to base (bd1a1d3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #146      +/-   ##
==========================================
+ Coverage   64.91%   69.02%   +4.10%     
==========================================
  Files          28       28              
  Lines        2460     2460              
==========================================
+ Hits         1597     1698     +101     
+ Misses        863      762     -101     

Impacted Files	Coverage Δ
src/Spaces/Ultraspherical/ContinuousSpace.jl	54.28% <0.00%> (+0.71%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	76.08% <0.00%> (+0.72%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	63.36% <0.00%> (+0.99%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <0.00%> (+1.35%)	⬆️
src/Spaces/Ultraspherical/Ultraspherical.jl	77.77% <0.00%> (+1.85%)	⬆️
src/Spaces/Ultraspherical/DirichletSpace.jl	48.11% <0.00%> (+2.83%)	⬆️
src/roots.jl	73.91% <0.00%> (+3.47%)	⬆️
src/Domains/IntervalCurve.jl	86.36% <0.00%> (+4.54%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	77.51% <0.00%> (+6.97%)	⬆️
src/show.jl	55.88% <0.00%> (+8.82%)	⬆️
... and 5 more

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