Refactor computeNewEmpiricalCases into module with unit tests.

[abrie]

Related issues and PRs

Related to this Fixme, an incremental refactoring of the DeterministicLinePlot component.

(Additional context: #636, #671)

Description

Reduce the code complexity of DeterministicLinePlot.tsx by extracting the computeNewEmpiricalCases() methods into a utility module. Also adds units tests for the method to aid future refactoring.

Impacted Areas in the application

Slight reorganization of the code. Adds more unit tests.

Testing

Adds units tests for computenewEmpiricalCases in the Utils.ts module.

Run yarn test to test.

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[codecov[bot]]

Codecov Report

Merging #677 into master will increase coverage by 0.76%. The diff coverage is 91.30%.

@@            Coverage Diff             @@
##           master     #677      +/-   ##
==========================================
+ Coverage   24.87%   25.63%   +0.76%     
==========================================
  Files         128      128              
  Lines        2762     2762              
  Branches      393      393              
==========================================
+ Hits          687      708      +21     
+ Misses       2075     2054      -21     

Impacted Files	Coverage Δ
.../components/Main/Results/DeterministicLinePlot.tsx	0.00% <0.00%> (ø)
src/components/Main/Results/Utils.ts	96.66% <95.45%> (-3.34%)	:arrow_down: