Bayern Munich and Stuttgart played a friendly match against strong opponents. However, Bayer Leverkusen probably invited one of the lower league teams for a friendly match to test their young players. I am sure Leverkusen had the opportunity to test many players in this match. The development of young players is very important for the coach. I think it was a good match to see the development of these players.
That was smart decision by Bayer Leverkusen to plan friendly game against team from lower league. This way they could give their young players chance to play and see how well they are doing in situation that is not too stressful. By doing this coach can see what players are good at and what they need to work on which helps them to improve. It is great to see Leverkusen focusing on helping their young players get better and this game was probably very useful experience for them.