test: solve bring coverage greater then 85%

[aleattene]

Ref. issue #8

Reviewer:
@micheleriva

[codecov]

Codecov Report

Merging #11 (2d611d5) into main (39e7061) will increase coverage by 17.22%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main      #11       +/-   ##
===========================================
+ Coverage   81.17%   98.40%   +17.22%     
===========================================
  Files          19       19               
  Lines         324      125      -199     
  Branches       51        6       -45     
===========================================
- Hits          263      123      -140     
+ Misses         61        2       -59     

Impacted Files	Coverage Δ
src/array/chain/index.ts	83.33% <0.00%> (-7.58%)	⬇️
src/array/sum/index.ts	100.00% <0.00%> (ø)
src/array/drop/index.ts	100.00% <0.00%> (ø)
src/array/head/index.ts	100.00% <0.00%> (ø)
src/array/last/index.ts	100.00% <0.00%> (ø)
src/array/take/index.ts	100.00% <0.00%> (ø)
src/array/union/index.ts	100.00% <0.00%> (ø)
src/array/unzip/index.ts	100.00% <0.00%> (ø)
src/object/omit/index.ts	100.00% <0.00%> (ø)
src/string/lines/index.ts	100.00% <0.00%> (ø)
... and 9 more

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[micheleriva]

@aleattene awesome job!!