Tests/mathjax upgrade

[zorkow]

Upgrades the use of MathJax in test transformers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.61%. Comparing base (397026d) to head (475ff52).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #838   +/-   ##
========================================
  Coverage    92.61%   92.61%           
========================================
  Files          165      165           
  Lines        40237    40237           
  Branches      4448     4443    -5     
========================================
  Hits         37266    37266           
  Misses        2971     2971           

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