Add tests for src/reformulations

[odow]

Part of #542

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0b5ae45) 95.45% compared to head (1d2efb2) 96.12%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/reformulations/quadform.jl	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #566      +/-   ##
==========================================
+ Coverage   95.45%   96.12%   +0.66%     
==========================================
  Files          91       91              
  Lines        5107     5078      -29     
==========================================
+ Hits         4875     4881       +6     
+ Misses        232      197      -35     

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