Question

Hello, How would I test this in Junit? Is there anything else I can do with my code?

import java.text.DecimalFormat;

public class PayCalculator implements Constants {
  
   private String employeeName;
   private int reportID;
   private double hourlyWage;
   private static int ID = 0;
   private static int reportIDGenerator = 1000;
   public int[] overtimes = HOURS_WORKED;

public PayCalculator(String name) {
   super(); {
   this.reportID = reportIDGenerator;
   reportIDGenerator+=10;
   this.overtimes = HOURS_WORKED;
   }
}
public PayCalculator(String name, double hourlyWage) {
   this.reportID = reportIDGenerator;
reportIDGenerator+=10;
this.employeeName = name;
this.hourlyWage = hourlyWage;
this.overtimes = HOURS_WORKED;
}

public String getEmployeeName() {
return employeeName;
}

public void setEmployeeName(String employeeName) {
this.employeeName = employeeName;
}

public int getReportID() {
return reportID;
}

public double getHourlyWage() {
return hourlyWage;
}

public void setHourlyWage(double hourlyWage) {
this.hourlyWage = hourlyWage;
}
  
@Override
public String toString() {
return "PayCalculator [employeeName=" + employeeName + ", reportId=" + reportID +
       ", hourlyWage=" + hourlyWage+ "]";
}
public double calculateYearlyGrossPay(){
double totalGross = 0.0;
for(int period = 1; period <= PAY_PERIODS_IN_YEAR; period++){
totalGross += calculateGrossForPeriod(period);
}
return totalGross;
}
public double calculateYearlyNetPay(){
double totalNet = 0.0;
for(int period = 1; period <= PAY_PERIODS_IN_YEAR; period++){
totalNet += calculateNetPayForPeriod(period);
}
return totalNet;
}
public double calculateNetPayForPeriod(int periodNumber){
double gross = calculateGrossForPeriod(periodNumber);
double tax = calculateTax(gross);
double netPay = gross-tax;
return netPay;
}
public double PAY_PERIODS_IN_YEAR(int periodNumber){
double gross = calculateGrossForPeriod(periodNumber);
double tax = calculateTax(gross);
double netPay = gross-tax;
return netPay;
}
public void printNetPayForAllPeriods(){
DecimalFormat df = new DecimalFormat("#.00");
System.out.println("NET PAY for all periods:\n");
for(int period =1; period <= PAY_PERIODS_IN_YEAR; period++){
System.out.println("PERIOD:"+period+" NET PAY:"+df.format(calculateNetPayForPeriod(period)));
}
}
public void increaseWageRate(double percentage){
hourlyWage =hourlyWage+ hourlyWage*(percentage/100);
}

private double calculateGrossForPeriod(int periodNumber){
double regulayPay = FULL_TIME*hourlyWage;
double overtimePay = overtimes[periodNumber-1]*(hourlyWage*OVERTIME_RATE);
double gross= regulayPay+overtimePay;
return gross;
}
private double calculateTax(double gross){
double federalTax = gross*FEDERAL_TAX_RATE;
double stateTax = gross*STATE_TAX_RATE;
return federalTax+stateTax;
}
  
}

public interface Constants {
  
   public final int[] HOURS_WORKED = {89, 80, 19, 73, 44, 99, 77, 0, 80, 70, 80, 87, 84, 82,
           80, 30, 89, 90, 100, 120, 0, 69, 99, 91, 83, 80};
  
   public final int PAY_PERIODS_IN_YEAR = 26;
   public final double FEDERAL_TAX_RATE = 0.2;
   public final double STATE_TAX_RATE = 0.09;
   public final double OVERTIME_RATE = 1.5;
   public final double FULL_TIME = 80;
  
   public final int PAY_PERIOD_1 = 0;
   public final int PAY_PERIOD_2 = 1;
   public final int PAY_PERIOD_3 = 2;
   public final int PAY_PERIOD_4 = 3;
   public final int PAY_PERIOD_5 = 4;
   public final int PAY_PERIOD_6 = 5;
   public final int PAY_PERIOD_7 = 6;
   public final int PAY_PERIOD_8 = 7;
   public final int PAY_PERIOD_9 = 8;
   public final int PAY_PERIOD_10 = 9;
   public final int PAY_PERIOD_11 = 10;
   public final int PAY_PERIOD_12 = 11;
   public final int PAY_PERIOD_13 = 12;
   public final int PAY_PERIOD_14 = 13;
   public final int PAY_PERIOD_15 = 14;
   public final int PAY_PERIOD_16 = 15;
   public final int PAY_PERIOD_17 = 16;
   public final int PAY_PERIOD_18 = 17;
   public final int PAY_PERIOD_19 = 18;
   public final int PAY_PERIOD_20 = 19;
   public final int PAY_PERIOD_21 = 20;
   public final int PAY_PERIOD_22 = 21;
   public final int PAY_PERIOD_23 = 22;
   public final int PAY_PERIOD_24 = 23;
   public final int PAY_PERIOD_25 = 24;
   public final int PAY_PERIOD_26 = 25;
}

Answer 1

I would share you some snapshots from one of existing project to show how junit can be applied successfully

So this is the general structure of the project and the imports you would need .

E Quick Access - a PO Java EE - shoppingbackend/src/test/java/com/homsil/shoppingbackend/test/Cooklest.java - Eclipse File Edit Source Refactor Navigate Search Project Run Window Help D IONIQUE E O O XO 69 ?- - - Project Explorer X $ - a confirmyour... databaseQue... D PageControl... page.jsp UserDetailD... CookTest.java X onlineshopping [online-shopping master] L 1 package com.homsil.shoppingbackend.test; > Servers > shoppingbackend [online-shopping master] 3e import static org.junit.Assert.assertEquals; src/main/java com.homsil.shoppingbackend 5 import org.junit. BeforeClass; ► at com.homsil.shoppingbackend.config import org.junit.Test; > E com.homsil.shoppingbackend.dao import org.springframework.context.annotation. AnnotationConfigApplicationContext; . com.homsil.shoppingbackend.daoimpl 9 import com.homil.shoppingbackend.dao. CookDAO; > CookDAOImpl.java 10 import com.homsil.shoppingbackend.dto. Cook; Location DAOImpl.java ProductDAOImpl.java 12 public class CookTest { > L UserDetailDAOImpl.java com.homsil.shoppingbackend.dto private static AnnotationConfigApplicationContext context; src/test/java #com.homsil.shoppingbackend . com.homsil.shoppingbackend.test private static CookDAO cookDAO; ► D. CookTest.java ► de Location Test.java ► do ProductTestCase.java oio con

You can multiple test cases like

   @Test
   public void testGetCook() {
      
       cook = cookDAO.get(3);
      
      
       assertEquals("Successfully fetched a single cook from the table!","Television",cook.getName());
      
      
   }
  
  
   @Test
   public void testUpdateCook() {
      
       cook = cookDAO.get(3);
      
       cook.setName("TV");
      
       assertEquals("Successfully updated a single cook in the table!",true,cookDAO.update(cook));
      
      
   }
  

This code is from the same file . the important line is the assertEquals for you . So if the update has been successfull then the test case pass .

74 750 /* 76 77 @Test public void testDeleteCook() { cook = cookDAO.get (3); assertEquals("Successfully deleted a single cook in the table!", true, cookDAO. delete (cook)); 83 */ 840 / 86 @Test public void testList Cook() { assertEquals("Successfully fetched the list of categories from the table!", 3, COOKDAO.list().size());

After that you need to write click on the file and Run As --> Junit .

So for your example , you need to run the test case on your methods for example .

private double calculateTax(double gross){
double federalTax = gross*FEDERAL_TAX_RATE;
double stateTax = gross*STATE_TAX_RATE;
return federalTax+stateTax;
}

assertEquals("Successfully calculated test",expectedvalue,calculateTax(100.00));

@Test
   public void testUpdateCook() {
      
// Create the PayCalculator object here.
  assertEquals("Successfully calculated test",expectedvalue,obj.calculateTax(100.00));
      
      
   }

Hope this helps.