Add test for ProductSpace domain

[jishnub]

No description provided.

[codecov]

Codecov Report

Base: 60.95% // Head: 67.10% // Increases project coverage by +6.15% 🎉

Coverage data is based on head (ad8397a) compared to base (a94565e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
+ Coverage   60.95%   67.10%   +6.15%     
==========================================
  Files          28       28              
  Lines        2492     2493       +1     
==========================================
+ Hits         1519     1673     +154     
+ Misses        973      820     -153     

Impacted Files	Coverage Δ
src/Spaces/PolynomialSpace.jl	89.10% <0.00%> (+0.38%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <0.00%> (+1.35%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	59.57% <0.00%> (+1.41%)	⬆️
src/Spaces/Ultraspherical/Ultraspherical.jl	79.31% <0.00%> (+1.72%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	65.04% <0.00%> (+1.94%)	⬆️
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/Domains/Arc.jl	63.41% <0.00%> (+12.19%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	80.30% <0.00%> (+12.50%)	⬆️
... and 7 more

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