In https://www.scalatest.org/user_guide/testing_with_mock_objects#mockito trait `MockitoSugar` is mentioned and linked still as part of ScalaTest. Link goes to 404 page. AFAIK `MockitoSugar` was moved since version 3.1.0 to https://github.com/scalatest/scalatestplus-mockito. Deprecation message in 3.0.8 don't mention the new library either. [Autofix for 3.1.x](https://github.com/scalatest/autofix/tree/master/3.1.x) don't help with this issue. I can't find anything related in [the release notes for 3.1.0](https://www.scalatest.org/release_notes/3.1.0)