If I have a basic accessor method that returns an ArrayList
What exactly would i test for it?
I am very inexperienced when it comes to testing.
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That depends on how you expect the method to behave. For example: If someone has called the method and changed the list that was retrieved, do you want those changes to show up the next time the getter is called? Either way, test that behaviour. What does the getter return when the list would be empty? Null or an empty list? This should also be tested.