test: code coverange

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

add tests

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #1114 into master will increase coverage by 1.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1114      +/-   ##
==========================================
+ Coverage   98.80%   99.82%   +1.01%     
==========================================
  Files          10       10              
  Lines         588      586       -2     
  Branches      180      177       -3     
==========================================
+ Hits          581      585       +4     
+ Misses          6        1       -5     
+ Partials        1        0       -1     

Impacted Files	Coverage Δ
src/plugins/postcss-import-parser.js	100.00% <ø> (ø)
src/index.js	100.00% <100.00%> (ø)
src/plugins/postcss-url-parser.js	100.00% <100.00%> (ø)
src/runtime/api.js	100.00% <0.00%> (+14.28%)	⬆️

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