VV-ISTIC-TP3/exercises/test-date-class.md

Test the Date class

Implement a class Date with the interface shown below:

class Date implements Comparable<Date> {

    public Date(int day, int month, int year) { ... }

    public static boolean isValidDate(int day, int month, int year) { ... }

    public static boolean isLeapYear(int year) { ... }

    public Date nextDate() { ... }

    public Date previousDate { ... }

    public int compareTo(Date other) { ... }

}

The constructor throws an exception if the three given integers do not form a valid date.

isValidDate returns true if the three integers form a valid year, otherwise false.

isLeapYear says if the given integer is a leap year.

nextDate returns a new Date instance representing the date of the following day.

previousDate returns a new Date instance representing the date of the previous day.

compareTo follows the Comparable convention:

• date.compareTo(other) returns a positive integer if date is posterior to other
• date.compareTo(other) returns a negative integer if date is anterior to other
• date.compareTo(other) returns 0 if date and other represent the same date.
• the method throws a NullPointerException if other is null

Design and implement a test suite for this Date class. You may use the test cases discussed in classes as a starting point. Also, feel free to add any extra method you may need to the Date class.

Use the following steps to design the test suite:

1. With the help of Input Space Partitioning design a set of initial test inputs for each method. Write below the characteristics and blocks you identified for each method. Specify which characteristics are common to more than one method.
2. Evaluate the statement coverage of the test cases designed in the previous step. If needed, add new test cases to increase the coverage. Describe below what you did in this step.
3. If you have in your code any predicate that uses more than two boolean operators check if the test cases written to far satisfy Base Choice Coverage. If needed add new test cases. Describe below how you evaluated the logic coverage and the new test cases you added.
4. Use PIT to evaluate the test suite you have so far. Describe below the mutation score and the live mutants. Add new test cases or refactor the existing ones to achieve a high mutation score.

Use the project in tp3-date to complete this exercise.

Answer