Use parallel tests + avoid partial matching

[olivroy]

Prework

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Summary

Speed up test by using testthat parallel (on CI -2 minutes for testing on ubuntu (10min44 to 9min29) + avoid partial matching (caught by having this set in Rprofile)

  options(
    warnPartialMatchArgs = TRUE,
    warnPartialMatchDollar = TRUE,
    warnPartialMatchAttr = TRUE
  )

This contribution is meaningless, but thought I'd send it anyway! By looking at the most time consuming tests, I set them to run first with testthat which reduces test run time !

I am actually trying to find a way to make messages more colorful but didn't succeed (yet)

My goal is to end up with a message that looks like this

Currently, it looks like this

[wlandau]

Thanks for pointing out those partial matches, I have fixed them in ab30e7b.

I am less sure about parallel tests because targets already launches external processes and CRAN has a strict limit of 2 total.

[olivroy]

Great! I will close in this case. I read that it should be handled already r-lib/testthat#1114 (comment), but can't confirm it