Adds some unit tests for local key initialization

[joelgallant]

In an effort to improve code coverage, just chipping away at non-tested functions. (the ones that aren't are usually like this, requiring more instrumentation)

[cypress[bot]]

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Test summary

1 • 0 • 0 • 0

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Run details

Project	App Config
Status	Passed
Commit	ec85d3391e
Started	Jan 2, 2021 3:07 AM
Ended	Jan 2, 2021 3:07 AM
Duration	00:09 💡
OS	Linux Ubuntu - 18.04
Browser	Electron 87

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[codecov-io]

Codecov Report

Merging #83 (ec85d33) into master (5cfa0d1) will increase coverage by 2.42%. The diff coverage is 86.48%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   67.32%   69.75%   +2.42%     
==========================================
  Files          21       21              
  Lines        1420     1448      +28     
  Branches      286      290       +4     
==========================================
+ Hits          956     1010      +54     
+ Misses        269      245      -24     
+ Partials      195      193       -2     

Impacted Files	Coverage Δ
app-config/src/encryption.ts	46.30% <62.50%> (+8.17%)	:arrow_up:
app-config/src/logging.ts	58.06% <66.66%> (+0.37%)	:arrow_up:
app-config/src/test-util.ts	100.00% <100.00%> (ø)
app-config/src/common.ts	67.92% <0.00%> (+13.20%)	:arrow_up:

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