Noisy output when running tests :(

When running tests, there's a lot of noisy output. This is caused by the usage of $stderr.puts inside classes.

There are plenty of ways to fix that:

• Surround function calls that uses $stderr.puts with a capture_io. The last comes with minitest
• Create a dependency injections that we could manage $stderr.puts
• Stubbing $stderr for tests
• ...

I like the dependency injection. Any other suggestions ?

Start by locating the classes that call $stderr.puts and review the existing Minitest setup, especially capture_io. Compare the proposed capture_io, dependency-injection, and $stderr-stubbing approaches before choosing one. Done means the tests no longer produce the reported noisy output and the relevant test coverage still passes.