Add ultraspherical tests

[jishnub]

For some reason, the ultraspherical tests seems to have been missed out

[codecov]

Codecov Report

Base: 61.78% // Head: 69.05% // Increases project coverage by +7.27% 🎉

Coverage data is based on head (baa3b39) compared to base (591136c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #195      +/-   ##
==========================================
+ Coverage   61.78%   69.05%   +7.27%     
==========================================
  Files          28       28              
  Lines        2546     2608      +62     
==========================================
+ Hits         1573     1801     +228     
+ Misses        973      807     -166     

Impacted Files	Coverage Δ
src/Spaces/PolynomialSpace.jl	92.21% <100.00%> (+2.55%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <0.00%> (+1.35%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	59.85% <0.00%> (+1.40%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	65.04% <0.00%> (+1.94%)	⬆️
...c/Spaces/Ultraspherical/UltrasphericalOperators.jl	79.32% <0.00%> (+2.51%)	⬆️
src/Spaces/Ultraspherical/ContinuousSpace.jl	54.28% <0.00%> (+3.03%)	⬆️
src/show.jl	55.88% <0.00%> (+8.82%)	⬆️
src/Spaces/Ultraspherical/DirichletSpace.jl	50.00% <0.00%> (+9.80%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	82.98% <0.00%> (+11.45%)	⬆️
... and 9 more

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