# Reviewing Test Sessions and Runs in Distributional

After you define and execute tests, dbnl creates a Test Session to mark a permanent statement of how your app behaved relative to expectations.  You can explore this Test Session, as well as the Runs that were tested, to learn about your app -- both its behavior and about how users interacted with it.

The [basic review process](https://docs.dbnl.com/v0.19.x/using-distributional/testing/reviewing-tests) is available for all tests, including any tests you may have created with [expert knowledge](https://docs.dbnl.com/v0.19.x/learning-about-distributional/defining-tests-in-distributional/knowledge-based-test-creation).  In this section, we highlight key insights that can be gained from the automated Production tests, insights from elsewhere in the Distributional UI, and how you can be notified about your Test Session status in whatever fashion you prefer.