public void Update_modifies_item_in_db()
{
var changedData = new Gutachter
{
Id = 2,
Nachname = "TEST",
Vorname = "TEST",
EMail = "*****@*****.**"
};
_sut.Update(changedData);
Gutachter vorherKlaus = _inMemoryDbSet.First(x => x.Id == 2);
Assert.That(vorherKlaus.Vorname, Is.EqualTo(changedData.Vorname), "Vorname should change");
Assert.That(vorherKlaus.Nachname, Is.EqualTo(changedData.Nachname), "Nachname should change");
Assert.That(vorherKlaus.EMail, Is.EqualTo(changedData.EMail), "EMail should change");
Assert.That(vorherKlaus.Gutachten.Count, Is.EqualTo(1), "Gutachten should not be changed");
_mockedContext.Verify(x => x.SaveChanges(), Times.Once());
}