Add return types for normalization factor.

[ajscimone]

No description provided.

[codecov-io]

Codecov Report

Merging #9 into master will increase coverage by 1.27%.
The diff coverage is 88.89%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   84.41%   85.68%   +1.27%     
==========================================
  Files           8        8              
  Lines         417      419       +2     
==========================================
+ Hits          352      359       +7     
+ Misses         65       60       -5

Impacted Files	Coverage Δ
src/btwxt.h	11.11% <ø> (ø)	⬆️
src/gridpoint.h	0% <ø> (ø)	⬆️
src/btwxt.cpp	71.05% <100%> (+7.89%)	⬆️
src/gridpoint.cpp	90.5% <80%> (+1.24%)	⬆️

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[nealkruis]

@ajscimone Let's add a couple of unit tests in this repo to ensure we're getting the right output back. You can more-or-less use the same cases we used for EnergyPlus.

[ajscimone]

@nealkruis unit tests should now be added for scalar return functionality for both btwxt itself and GridPoints. There are two unit tests apiece, adding four total to the library. I have created a new test fixture named "TwoDSimpleNormalizationFixture" which is a 2D fixture which has very simple data corresponding to a f(x,y)=x*y type linear function to make this testing simpler and easy to read/understand. I am currently testing that both a single scalar target and a compound scalar are normalizing and returning correctly. Please take a look and let me know if you find these satisfactory, if they need cleaned up stylistically, or if tests should be expanded further.

[tanaya-mankad]

I was going to go through the math manually, but as Neal's done it, I'll click approve.