newrelic-ruby-agent
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Upgrade minitest
We have a lot of different versions of minitest installed in our application. The Envfiles install some versions, the gemspec installs a different version, and there could be other installations too.
I'm now seeing deprecation warnings related to Minitest 6. Let's get our codebase ready for this new version by consolidating the minitest installs in the application and resolving the deprecation warnings.
Minitest 6 doesn't work on Ruby 2.2
https://issues.newrelic.com/browse/NEWRELIC-3438
We should keep in mind issues we experienced when upgrading to minitest 5 when considering upgrading again. https://github.com/newrelic/newrelic-ruby-agent/pull/1445