Task Description: Modify the attached Book class to accommodate multiple authors using one of the components from the Java Collection Framework. Requires one book with an isbn and a Collection of authors. Use generics.  Modify the JUnit test to accomidate the changes made.

JUnit:

Guidance for testValidate: Test for at least two cases (one where book properties are empty or hold a null value and one where they do not)

Guidance for testEquals: Test for at least two cases (one where authors and isbn match, one where they do not). Test for at least two authors.