Why is % "test" removed?

Well, I just copied sbt line from Scaladex. Actually, adding % "test" don't hurts.

Yeah, http://www.scalatest.org/install suggests having % "test".

But what's the purpose of % "test"? The example work flawlessly with or without it.

Often a dependency is used by your test code (in src/test/scala, which is compiled by the Test configuration) but not your main code.

If you want a dependency to show up in the classpath only for the Test configuration and not the Compile configuration, add % "test" [...]

https://www.scala-sbt.org/release/docs/Library-Dependencies.html#Per-configuration+dependencies

Thank you!