test: Add testing for set-tokens.ts

[peaceiris]

• Add test
• Fix e.message

[codecov]

Codecov Report

Merging #126 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #126   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files           2        2           
  Lines          68       68           
  Branches       14       14           
=======================================
  Hits           65       65           
  Misses          3        3

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[codecov]

Codecov Report

Merging #126 into master will decrease coverage by 27.64%.
The diff coverage is 75.86%.

@@             Coverage Diff             @@
##           master     #126       +/-   ##
===========================================
- Coverage   95.58%   67.93%   -27.65%     
===========================================
  Files           2        3        +1     
  Lines          68      131       +63     
  Branches       14       22        +8     
===========================================
+ Hits           65       89       +24     
- Misses          3       42       +39

Impacted Files	Coverage Δ
src/get-inputs.ts	100% <100%> (+6.89%)	⬆️
src/set-tokens.ts	44% <69.56%> (ø)
src/utils.ts	100% <0%> (+2.56%)	⬆️

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