Create a public class named Course.
Course should store two pieces of data: a name (as a String?) using the property name
and an enrollment (as an Int) using the property enrollment.
Provide a constructor that allows both properties to be set, with the name first.
The name property should be publicly readable but not publicly writable, while enrollment should be both
publicly readable and writable.
Finally, reject negative enrollment values and null names.
You're challenge is to write tests for this problem described above.
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