Practice

1. For the Calculator class created on Day 04, write JUnit test cases. For each of the methods that perform addition, subtraction, multiplication and division, write test cases to check if each method works correctly.
2. For the same problem in 1., perform validations to avoid DivideByZero Arithmetic Exception to occur on the divide method. Write a test case to check if the validation works correctly.
3. For the UserValidator.validate(User user) method created on Day 13 please write JUNIT Test cases. Please ensure to create test methods for each of the paths of your validate method: including error paths.