So, it's a good thing to have a Test Environment.
Having the flag that lets us know which environment we're logging into set to "Production"? Not so much.
However, we have two tests to help verify that we are actually in Test Environment. One is, open up the OR Scheduler; compare it to the same app for the same day in Production. Good clue. The second is, if it's Slow As Molasses in an Ice Age, you're in Test.