dev: use minitest-parallel_fork to speed up the suite #3001
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With NCPU=7 I can usually get the suite done in under 1.8 seconds on my laptop (inspired by tldr) Note that we stop using minitest-reporters in the main suite because the two gems aren't compatible. I wasn't often using minitest-reporters features, anyhow. However, we're keeping minitest-reporters in the Gemfile because we use it in some of the CI scripts like test-gem-installation where the spec output is useful.
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What problem is this PR intended to solve?
Faster test suite in development!
With NCPU=7 I can usually get the suite done in under 1.8 seconds on my laptop (inspired by tldr)
Note that I dropped minitest-reporters because the two gems aren't compatible. I wasn't often using minitest-reporters features, anyhow.