Use Junit and Eclipse environment to finish the following questions. (15pts)

Review the slides and add Junit library before running your tests. You need to create a new Project first, and then add the files.

Due date: November 6^th, Monday. 11:59pm. Submit all screenshots of test result and test files.

1-Use the following code and write a test file called FactorialExceptionTest.java for the following factorial function. Test if it will throw an IllegalArgumentException exception if the parameter of the function is -3. (5pts)

/**

* Calculate the factorial of a number

*/

public class Factorial_1 {

public int factorial(int n) {

if (n < 0)

throw new IllegalArgumentException( "factorial cannot handle negative numbers!!" );

if (n == 0)

return 1;

else

return n * factorial(n - 1);

}

}

2-Write a parameterized test for the factorial function in question 1. Note: remember to import necessary packages. And your test class needs to test the factorial of four numbers: 3, 4, 2, 5 (5pts)

3-Write a test suite FactorialTest.java that includes the test files you wrote in question 1, and 2. (5pts)