How do you know that the application is overtested?
There must be millions of different answers to your question. Could you be more specific please?
.. when you come home from work and the milk you put in the refridgerator the last time you were home has soured.
.. you only see the sun while going to work in the mornings.
.. the vending machine is your main source of nutrition.
.. weekends are anticipated because that's when your boss isn't in the office.