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0 / 1

A test case is a set of input values, and the expected return value when the
method is run with the input values.

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0 / 1

There are many possibilities:

n             : -1     
returned list : []

n             :  0     
returned list : [0]

n             :  1     
returned list : [0, 1]

n             :  5     
returned list : [0, 1, 2, 3, 4, 5]
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0 / 3

There are many possibilities, but the easiest is:

return this.studentNumber.hashCode();

hashCode should ideally return a unique value for every student number.
This implementation is better because no two students have the same
student number, but many (all?) students have a student number of the
same length.
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