In many cases a tester begins testing by playing a game like anyone else would. If you want to see Die Nachtblume - The Night Flower being played through, with the development version being the version played, please thank my friend who volunteered to stream it. You can watch his recording on YouTube.
Yes, there are bugs, but it's good to see someone who has no previous knowledge of the game play it for testing purposes - or, on that note, someone who likes other genres of games. While this is solidly an RPG, it does have some horror elements, and so I'm testing with several testers with very different gaming backgrounds and preferences to test various aspects of the gameplay and story both.