When your build is finished, the environment where your build ran does not go away. Instead, you receive a link where you can go see the result before changes are merged into the master branch, and share it with your stakeholders. That way, your stakeholders are brought in much earlier in the process, saving the whole company huge amounts of time, money and aggravation.

If your build contains command line utilities or applications, you can test them in a more manual way by connecting to the build via the web-based SSH utility. This includes bash, perl, .NET (Powershell is included as well), javascript and many others.