I am using Visual Studio Coded UI as a test automation tool. Our project manager asked us to install a DevExpress extension to VS2012. I have been searching online but I didn't figure out how DevExpress will help us in our test automation path.
If you are building a DevExpress desktop application with WinForms then you need the extension to be able to interact with the DevExpress components. CodedUI is very limited without it, it creates extra hooks for MS UI Automation framework.
If you are testing a web-application with DevExpress tooling then I do not think you need to install the extensions.
Also see the documentation: https://documentation.devexpress.com/#CodedUIExtension/CustomDocument11028