Simple field tests

[malero]

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[codecov]

Codecov Report

Merging #3 into master will increase coverage by 9.18%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage    75.3%   84.48%   +9.18%     
==========================================
  Files           9       10       +1     
  Lines         332      348      +16     
  Branches       54       55       +1     
==========================================
+ Hits          250      294      +44     
+ Misses         58       25      -33     
- Partials       24       29       +5

Impacted Files	Coverage Δ
src/fields/Field.ts	89.13% <100%> (+6.43%)	⬆️
src/fields/BooleanField.ts	77.27% <71.42%> (ø)
src/fields/StringField.ts	77.27% <0%> (+18.18%)	⬆️
src/fields/EmailField.ts	79.16% <0%> (+24.99%)	⬆️
src/fields/FloatField.ts	80.76% <0%> (+30.76%)	⬆️
src/fields/PositiveNumberField.ts	82.75% <0%> (+37.93%)	⬆️

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