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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The rspec-rails gem falls back to rails' minitest code to do some things and there are some bugs with lifecycle hooks for example, check here https://github.com/rspec/rspec-rails/issues/2526 and https://github.com/rspec/rspec-rails/issues/2550 that needs workarounds, because rspec tests don't have the exact same lifecycle than minitest tests.
I know changing from RSpec to MiniTest requires some changes on how you organize the tests and how you think about writing them, but I found that I like MiniTest better after using it for more time, I think it goes straight to the point and it's better integrated (don't quote me on this, but I think minitest handles parallel tests better than RSpec in Rails app because that feature was added with mini test in mind, you would need to add an extra gem for rspec for that https://github.com/grosser/parallel_tests)