Add compiler tests.

[stefanseefeld]

No description provided.

[codecov-io]

Codecov Report

Merging #28 (199fc2d) into develop (ae0fb96) will increase coverage by 0.74%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #28      +/-   ##
===========================================
+ Coverage    79.54%   80.29%   +0.74%     
===========================================
  Files           71       71              
  Lines         4107     4105       -2     
===========================================
+ Hits          3267     3296      +29     
+ Misses         840      809      -31     

Impacted Files	Coverage Δ
src/faber/tools/gcc.py	97.14% <100.00%> (-0.13%)	⬇️
src/faber/tools/msvc.py	94.87% <100.00%> (+3.72%)	⬆️
src/faber/feature/value.py	87.85% <0.00%> (+0.93%)	⬆️
src/faber/tools/clang.py	88.75% <0.00%> (+2.50%)	⬆️
src/faber/tool.py	77.50% <0.00%> (+5.83%)	⬆️
src/faber/tools/cxx.py	91.17% <0.00%> (+5.88%)	⬆️
src/faber/tools/cc.py	81.25% <0.00%> (+6.25%)	⬆️
src/faber/action.py	97.70% <0.00%> (+7.63%)	⬆️

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