Change classDiagram file
Delete Course.class and CourseTest.class
Add test code for the get methods of Category
Add code for the get methods of Category
Add test code for the set methods of Category
Add code for the set methods of Category
Add test code for the caclulating the number of items in a Category
Add code for the caclulating the number of items in a Category
Add test  code for adding items in a Category
Add code for adding items in a Category
Add the working code for adding items in a category
Make changes to code to work with all the tests
Add test code for initializations with negative weight
Add code for initializations with negative weight
Add test code for setting negative weight
Add code for setting negative weight
Add code for initializing and setting empty weight and name
Add code for initializing and setting empty weight and name
Changed the field weight to int and modified code to pass all the test cases
Add test code for calculating the total earned grades