I need some help coding this file. The Course class describes a course, including its name and maximum capacity. I have included the tests. Thank you!

package scheduler;

import java.util.List;

/**

* A class representing a Course.

*

* @author liberato

*

*/

public class Course {

/**

* Instantiates a new Course object. The course number must be non-empty, and the

* capacity must be greater than zero.

* @param courseNumber a course number, like "COMPSCI190D"

* @param capacity the maximum number of students that can be in the class

* @throws IllegalArgumentException thrown if the courseNumber or capacity are invalid

*/

public Course(String courseNumber, int capacity) throws IllegalArgumentException {

}

/**

*

* @return the capacity of the course

*/

public int getCapacity() {

return -1;

}

/**

*

* @return the course number

*/

public String getCourseNumber() {

return null;

}

/**

* Returns the list of students enrolled in the course.

*

* This returned object does not share state with the internal state of the Course.

*

* @return the list of students currently in the course

*/

public List getRoster() {

return null;

}

}

CourseTest.java

package scheduler;

import org.junit.Test;

import static org.junit.Assert.*;

import org.junit.Before; import org.junit.Rule; import org.junit.Test; import org.junit.rules.Timeout;

public class CourseTest { // uncomment the following if you're trying to diagnose an infinite loop in a test // @Rule // public Timeout globalTimeout = Timeout.seconds(10); // 10 seconds

private Course course; private String courseNumber; private int capacity; // This method is run before each test, performing initialization // on objects for the test. @Before public void setup() { courseNumber = "COMPSCI190D"; capacity = 120; course = new Course(courseNumber, capacity); } @Test public void testGetCourseNumber() { assertEquals(courseNumber, course.getCourseNumber()); }

@Test public void testGetCapacity() { assertEquals(capacity, course.getCapacity()); } @Test public void testGetRosterEmpty() { assertTrue(course.getRoster().isEmpty()); } @Test(expected = IllegalArgumentException.class) public void testInvalidCourseNumber() { Course c = new Course("", 20); }

@Test(expected = IllegalArgumentException.class) public void testInvalidCapacity() { Course c = new Course("COMPSCI190D", 0); } }