Test for inf norm

[jishnub]

Test for JuliaApproximation/ApproxFunBase.jl#570

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -3.74% ⚠️

Comparison is base (c48fd6f) 72.37% compared to head (679707e) 68.64%.
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
- Coverage   72.37%   68.64%   -3.74%     
==========================================
  Files          29       29              
  Lines        2744     2746       +2     
==========================================
- Hits         1986     1885     -101     
- Misses        758      861     +103     

Files Changed	Coverage Δ
src/Spaces/Jacobi/JacobiOperators.jl	80.76% <100.00%> (-4.68%)	⬇️
src/Spaces/PolynomialSpace.jl	93.23% <100.00%> (-0.18%)	⬇️

... and 13 files with indirect coverage changes

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