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In a non-static method, the keyword this refers to the object that
was used to invoke the method.
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B an object is never equal to null

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There are many possible answers. Here are 2:

t                     : [1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 9]
expected return value : Integer.MAX_VALUE
explanation           : tests a list that contains a value that is greater
                        than Integer.MAX_VALUE

t                     : [-1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 9]
expected return value : Integer.MIN_VALUE
explanation           : tests a list that contains a value that is less
                        than Integer.MIN_VALUE

                        
You might also include a test case that checks if t is unchaged:

t                     : [1, 2, 3]
expected return value : 123
expected state of t   : [1, 2, 3]
explanation           : Tests if the the list t is unchanged by the method
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