Below is a class for which I want to write JUnit test cases. Can anyone help me

Question

Below is a class for which I want to write JUnit test cases. Can anyone help me in writing test cases for the class?

The application is about the online parking garage. There are many classes. This is one of them which is used for Transaction after the reservation is done.

I am new with Junit, kindly help.

package comp.design.parkingsystem;

import java.math.BigInteger;

import java.sql.Date;

import java.sql.SQLException;

import java.util.Calendar;

public class Transaction {

BigInteger id;

public Date time;

public Money amount;

public double tax;

public BigInteger accountNumber, routingNumber;

public Money total() {

return new Money();

}

private static final float RATE = 4; // Dollars per hour

private static final float MAX_DAY = 30;

// Purpose: Takes two calendar objects and returns the difference in time

public static float getTimeDifference(Calendar calFirst, Calendar calSecond) {

if (calFirst.after(calSecond)) {

return 0;

}

float time_in_milli = calFirst.getTimeInMillis();

float time_out_milli = calSecond.getTimeInMillis();

float time_total_milli = time_out_milli - time_in_milli;

float time_total_hour = time_total_milli / 1000 / 60 / 60; // convert milliseconds to hour

return time_total_hour;

}

public static float getPrice(Reservation r) {

Calendar reservedTimeIn = r.reservationInformation().get(0);

Calendar reservedTimeOut = r.reservationInformation().get(1);

Calendar actualTimeIn = r.reservationInformation().get(2);

Calendar actualTimeOut = r.reservationInformation().get(3);

float earlyTime = getTimeDifference(actualTimeIn, reservedTimeIn);

float reservedTime = getTimeDifference(reservedTimeIn, reservedTimeOut);

float extraTime = getTimeDifference(reservedTimeOut, actualTimeOut);

float totalCost = (RATE * earlyTime) + (RATE * reservedTime);

if (totalCost > MAX_DAY) {

totalCost = MAX_DAY;

}

return totalCost;

}

public static float chargeCustomer(Reservation r) throws ClassNotFoundException, SQLException {

// Calculate price

double price = Transaction.getPrice(r);

// update Database

/* update Reservation Object

/*

* update Reservation Object update Reservation Database

*/

return (float) price;

}

}

Explanation / Answer

Please find below Junit class:

import static org.junit.jupiter.api.Assertions.*;

import java.util.ArrayList;

import java.util.Calendar;

import org.junit.jupiter.api.Test;

import org.mockito.Mockito;

import static org.mockito.Mockito.*;

class TransactionTest {

Transaction transaction=null;

@Test

public void getPriceTest() {

final float RATE = 4; // Dollars per hour

final float MAX_DAY = 30;

Calendar cal1 = Calendar.getInstance();

Calendar cal2 = Calendar.getInstance();

Calendar cal3 = Calendar.getInstance();

Calendar cal4 = Calendar.getInstance();

cal1.set(1995, 04, 3, 5, 0, 0);

cal2.set(1996, 04, 3, 5, 0, 0);

cal3.set(1997, 04, 3, 5, 0, 0);

cal4.set(1998, 04, 3, 5, 0, 0);

Reservation listMock = Mockito.mock(Reservation.class);

ArrayList<Calendar> al=new ArrayList<Calendar>();

al.add(cal1);

al.add(cal2);

al.add(cal3);

al.add(cal4);

when(listMock.reservationInformation()).thenReturn(al);

float earlyTime=Transaction.getTimeDifference(cal3, cal4);

float reservedTime = Transaction.getTimeDifference(cal1, cal2);

float totalCost = (RATE * earlyTime) + (RATE * reservedTime);

if (totalCost > MAX_DAY) {

totalCost = MAX_DAY;

}

assertEquals(totalCost, transaction.getPrice(listMock));

}

@Test

public void getTimeDifferenceTest() {

Calendar calFirst;

Calendar calSecond;

transaction=new Transaction();

float result=0.0f;

calFirst=Calendar.getInstance();

calSecond=Calendar.getInstance();

calFirst.set(2015, 07, 4, 6, 1, 1);

calSecond.set(2017, 04, 3, 5, 0, 0);

if (calFirst.after(calSecond)) {

System.out.println("Here");

result= 0;

}

float time_in_milli = calFirst.getTimeInMillis();

float time_out_milli = calSecond.getTimeInMillis();

float time_total_milli = time_out_milli - time_in_milli;

float time_total_hour = time_total_milli / 1000 / 60 / 60;

result=time_total_hour;

assertEquals(result,transaction.getTimeDifference(calFirst, calSecond));

}

}

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