No source code should break for 2.2.6, and it should be binary compatible with earlier 2.2.x releases. Other than expired deprecations, there should only be one breaking change in Scalactic 3.0.0-M15, which we don't expect will hit many users, and no breaking changes in ScalaTest 3.0.0-M15. Regardless you'll need to do a clean build to upgrade to 3.0.0-M15. The breaking change in Scalactic is described in the release notes at the above link.
Lastly, we have also released a Community Edition of the SuperSafe compiler plugin that will find errors in ScalaTest and Scalactic code without needing a license file. The currently version is 1.1.0-RC5, so if you can, please try that out on your projects and let us know if you encounter any problems. The features are described here:
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