Look up the Object Mother pattern. The idea is to have 'baked' objects which you can use repeatedly in tests, which fulfill a certain scenario. For example a ho

Look up the Object Mother pattern. The idea is to have 'baked' objects which you can use repeatedly in tests, which fulfill a certain scenario. For example a hotel reservation system needs to be able to handle a single person up to a whole family (maybe with an allergy or special needs thrown in for good measure). So you set up a bunch of Guest objects using a GuestObjectMother. When you make a change to Guest, you only need to change the GuestObjectMother and any tests that may directly be involved in the change to Guest. Tests that simply require a Guest to be involved in the test probably won't have to change, as they're simply retrieving the appropriate Guest object and then handing it off to something else.