Add US microsimulation test

[nikhilwoodruff]

Supersedes #284

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.10%. Comparing base (cf53c6d) to head (3aac09c).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
+ Coverage   79.73%   83.10%   +3.36%     
==========================================
  Files         192      193       +1     
  Lines       10057    10096      +39     
  Branches     1311     1316       +5     
==========================================
+ Hits         8019     8390     +371     
+ Misses       1753     1416     -337     
- Partials      285      290       +5     

Flag	Coverage Δ
	83.10% <100.00%> (?)

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[nikhilwoodruff]

Passing tests so merging.