Create a JUNIT test case for this function Test method for

Create a JUNIT test case for this function:

/**
   * Test method for {@link edu.odu.cs.cs350.Duration#add(edu.odu.cs.cs350.Duration)}.
   */
   @Test
   public final void testAdd() {
       fail(\"Not yet implemented\"); // TODO
   }

Based off this class definition:

package edu.odu.cs.cs350;

import java.util.Arrays;

/**
* A duration represents a period of elapsed time, e.g., 4 hours, 23 minutes, 2 seconds.
* This is differentiated from a point in time (e.g., 4:23:02AM). A meeting that
* has a duration of 2 hours has that same duration no matter where it was held. A
* starting time (point) for that of 2:00PM EST can be unambiguous only if the time
* zone is added.
*
* <p>
* Because durations are often used in calculations, both positive and
* negative values are possible.
*
* <p>
* Most of the accessor functions for this class will respond with normalized
* values, where the normalization rules are as follows:
* <ul>
* <li>The seconds and minutes components will have an absolute
* value in the range 0..59, inclusive.</li>
* <li>The hours component will have an absolute value in the
* range 0..23, inclusive.</li>
* <li>The sign of each component matches the sign of the
* overall duration. A duration of -61 seconds, for example,
* has normalized components of -1 seconds and -1 minutes.</li>
* </ul>
* Inputs to the member functions are not, however, required to
* be normalized. new Duration(0,0,3,-61) and new Duration(0,0,1,59)
* are both acceptable (and the resulting Duration objects are equal).
*
* @author zeil
*
*/
public class Duration implements Cloneable {

/**
* Construct a new duration, equivalent to
* Duration(0,0,0,0).
*/
public Duration() {
//ToDo
}

/**
* Create a new duration.
*
* @param totalSeconds total number of seconds in duration
*/
public Duration(long totalSeconds) {
//ToDo
}

/**
* Create a new duration.
*
* @param days number of days in duration
* @param hours number of hours in duration
* @param minutes number of minutes in duration
* @param seconds number of seconds in duration
*/
public Duration(int days, int hours, int minutes, int seconds) {
//ToDo
}

/**
* Get the total seconds of this duration, including the contributions
* of the days, hours, minutes, & seconds components.
*
* @return the total seconds
*/
public long getTotalSeconds() {
//ToDo
return 0;
}

/**
* Set the total seconds of this duration, potentially altering
* the days, hours, minutes, & seconds components.

* @param totalSeconds the total seconds to set
*/
public void setTotalSeconds(long totalSeconds) {
//ToDo
}

/**
* How many days in this duration?.
*
* @return the normalized days component
*/
public int getDays() {
//ToDo
return 0;
}

private static final long secondsPerHour = 60 * 60;

/**
* How many hours in this duration?.
*
* @return the normalized hours component
*/
public int getHours() {
//ToDo
return 0;
}

/**
* How many minutes in this duration?.
*
* @return the normalized minutes component
*/
public int getMinutes() {
//ToDo
return 0;
}

/**
* How many seconds in this duration?.
*
* @return the normalized seconds component
*/
public int getSeconds() {
//ToDo
return 0;
}

/**
* Add another duration to this one.
* @param dur a duration
*/
public void add(Duration dur) {
//ToDo
}

/**
* Subtract another duration from this one.
* @param dur a duration
*/
public void subtract(Duration dur) {
//ToDo
}

/**
* Multiply this duration by a scaling factor,
* rounding to the closest second.
* @param factor a scaling factor
*/
public void scale(double factor) {
//ToDo
}

/**
* Render the duration as
* d:h:m:s
* (preceded by a \'-\'if the duration is negative)
* where the four components are normalized non-negative
* integer values. The final three components are always rendered
* in 2 digits. The two leading components and their
* associated \':\' delimiters are omitted if the leading values
* are zero. E.g., Duration(0,-1,-59,-61) would be rendered as
* \"-02:00:01\".
*/
public String toString() {
//ToDo
return \"\";
}

// Comparison and hashing

/**
* Compares two durations for equality. They are considered equal if
* their getTotalSeconds() values are equal.
*
* @param obj object to be compared for equality with this duration
* @return <tt>true</tt> if the specified object is equal to this one
*/
public boolean equals(Object obj) {
//ToDo
return false;
}

/**
* Returns the hash code value for this object.
*
* @return the hash code value for this duration
*/
public int hashCode() {
//ToDo
return 0;
}

/**
* Return a (deep) copy of this object.
*/
@Override
public Object clone() {
//ToDo
return null;
}

}

/**
* Test method for {@link edu.odu.cs.cs350.Duration#add(edu.odu.cs.cs350.Duration)}.
*/

@Test
public final void testAdd() throws Exception {
// fail(\"Not yet implemented\");

// create 2 Duration objects and check with assetEquals(actual, expected);

Duration d1 = new Duration(20);

Duration d2 = new Duration(30);

// add d2 to d1

d1.add(d2);

int expectedSeconds = 50;

// use the assertEquals to test succesfully 2 objects added or not