add camera calibration test

[yakir12]

Tests camera calibration:

1. the RMS is lower than 1
2. the input arguments are correctly mutated as expected

[timholy]

Do you also need to add this file to runtests.jl?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 18.75%. Comparing base (2506aac) to head (c0370a8).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   18.75%   18.75%           
=======================================
  Files           3        3           
  Lines          32       32           
=======================================
  Hits            6        6           
  Misses         26       26           

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