feat: make tests run in parallel

[zivkovicmilos]

Description

This PR simply introduces t.Parallel() for unit tests that can support it.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c33c9f2) 55.96% compared to head (e747fd1) 55.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1312   +/-   ##
=======================================
  Coverage   55.96%   55.97%           
=======================================
  Files         420      420           
  Lines       65380    65380           
=======================================
+ Hits        36592    36598    +6     
+ Misses      25932    25926    -6     
  Partials     2856     2856           

see 2 files with indirect coverage changes

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[gfanton]

nice ! Do you have an after and before comparaison for test time ?

[zivkovicmilos]

nice ! Do you have an after and before comparaison for test time ?

@gfanton
I ran it locally on my tin-can i5 mac:

master branch:

make test.components 2>&1  1686.41s user 88.84s system 111% cpu 26:26.36 total
tee test.log  0.07s user 1.67s system 0% cpu 26:26.36 total

feat/parallel-tests branch:

make test.components 2>&1  1829.86s user 129.74s system 144% cpu 22:35.59 total
tee test.log  0.08s user 1.80s system 0% cpu 22:35.59 total

So ~4mins faster 🚀

(ignore the tee, I use it to capture any random test functionality)

Keep in mind our CI workflows are ran in parallel, and this is just a local test run; We should however see a slight increase in CI run speed

[thehowl]

Only touching tests and already approved multiple times, so merging!

I made an rg command to look for tests which still are not parallel (will contain false positives, but good if anyone wants to pick up your efforts:

rg --iglob '*_test.go' --pcre2 --sort=path -r '$1' -o -U 'func (Test[^\(]*)\(.*\n\t(?!t\.Parallel)'

🎉