Add unit test for sky grid module

[lpsinger]

Also, fix conversion of area to linear scale in sinusoidal grid method. The new test_skygrid unit test fails without this.

Where was the factor of 2/pi from, @mcoughlin? Is this a bug in sinusoidal, or a bug in the new test?

[codecov]

Codecov Report

Merging #56 (1a486a7) into main (529dd1e) will increase coverage by 4.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   27.05%   31.18%   +4.13%     
==========================================
  Files          27       28       +1     
  Lines        1327     1337      +10     
==========================================
+ Hits          359      417      +58     
+ Misses        968      920      -48     

Impacted Files	Coverage Δ
dorado/scheduling/skygrid/_sinusoidal.py	100.00% <100.00%> (+66.66%)	⬆️
dorado/scheduling/tests/test_skygrid.py	100.00% <100.00%> (ø)
dorado/scheduling/skygrid/_healpix.py	100.00% <0.00%> (+40.00%)	⬆️
dorado/scheduling/skygrid/_spiral.py	100.00% <0.00%> (+44.44%)	⬆️
dorado/scheduling/skygrid/_geodesic.py	97.56% <0.00%> (+78.04%)	⬆️

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[mcoughlin]

I presume some conversion when there was a mix of different kinds of FOV. Thanks for catching this!

[lpsinger]

Yeah, that makes sense. area = pi r^2, r = sqrt(area) / pi, diameter = 2 / pi * sqrt(area).