test: source maps

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

refactor tests + tests source maps with parallel true or false

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #372 (f897b3d) into master (0633c9d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #372   +/-   ##
=======================================
  Coverage   96.96%   96.96%           
=======================================
  Files           3        3           
  Lines         297      297           
  Branches      126      126           
=======================================
  Hits          288      288           
  Misses          8        8           
  Partials        1        1           

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