Fix incorrect babel config file reading

[alvaropinot]

Issue: #1148

What I did

• Add a basic test suite for babel_config that tests:

  • A plugins key present as an array.
  • A plugins key present as a string.
  • No plugins key present.

• Ensure that the config loads correctly in those 3 scenarios.

How to test

run:

 ./node_modules/jest/bin/jest.js babel_config

or manually use a .babelrc config file that follows those 3 scenarios.

[codecov]

Codecov Report

Merging #1156 into master will increase coverage by 0.59%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1156      +/-   ##
==========================================
+ Coverage   12.72%   13.31%   +0.59%     
==========================================
  Files         199      199              
  Lines        4582     4589       +7     
  Branches      727      725       -2     
==========================================
+ Hits          583      611      +28     
+ Misses       3356     3349       -7     
+ Partials      643      629      -14

Impacted Files	Coverage Δ
app/react/src/server/babel_config.js	44.82% <33.33%> (+44.82%)	⬆️
app/react/src/server/config/babel.js	100% <0%> (+100%)	⬆️

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[ndelangen]

Wow, can we have more of these PRs? ❤️ the unit tests!

Let me know if there's anything I can do for you.