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Knapsack Pro should be the first and only tool you reach for when starting to address long build and test times for Ruby apps. It's so easy to set up on your CI provider that you should do it now, even if you don't need parallelization today. That way, on the day where you first think that you wish tests were faster, you already have all the data and infrastructure you need to quickly half or quarter your build and test times.
Knapsack Pro