機能をカバーする単体テストの作成方法

Question

いつもお世話になっております

下記の画像を参照した、練習問題を説いているのですが、

シンプルに説明すると、
１）時給(HourlyPaid)
２）歩合(SalesCommisioned)
３）プロの歩合(Executive)
の3つに従業員（Employee）を分けて、それぞれの月収or年収を算出するプログラムです

コレ自体の処理はできたのですが、機能をカバーする単体テストを作成したいと考えていて、単体テストの具体的な方法がわからず、困っています

単体テストを行うのはこれが初めてで、具体的な書き方がよくわかりません
ご助力いただけると幸いです

Employee class Name of employee
HourlyPaid class Rate of pay
Total weekly hours worked

SalesCommissioned class Percentage commission on total sales
Total sales for month

Executive class Incremental point on annual salary scale

The methods used in each class may be summarized as follows:

Employee class getName
computePay

HourlyPaid class getRate
getHours

                                                               computePay

SalesCommissioned class getPercentage
getSales

                                                               computePay

Executive class getIncrement
computePay

ファイル構造としては、　Employee がスーパークラスでHourlyPaidとSalesCommisioned がEmployeeのサブクラスです　Executive　はSalesCommisionedのサブクラスになります

public abstract class Employee {

	private String name;

	public Employee(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Employee [name=" + name + "]";
	}
}

public class HourlyPaid extends Employee{

	public double wage;//wage per hour
	public double hours;//total hours in a week

	public HourlyPaid(String name, double wage, double hours) {
		super(name);
		this.wage = wage;
		this.hours = hours;
	}

	public double getWage() {
		return wage;
	}

	public void setWage(double wage) {
		this.wage = wage;
	}

	public double getHours() {
		return hours;
	}

	public void setHours(double hours) {
		this.hours = hours;
	}

	public double earnings() {
		if (getHours() <= 40) {//Not Overworked
			return getHours()*getWage();
		}
		//If it is more than 40 hours per week in Japan, hourly paid must times "1.25"
		else return getWage()*40 + getWage()*1.25*(getHours()-40);
	}

	@Override
	public String toString() {
		return "HourlyPaid [wage=" + wage + ", hours=" + hours + "]";
	}
}

public class SalesCommisioned extends Employee{

	private double commissionRate; // commission percentage
	private double monthSales; // gross monthly sales

	public SalesCommisioned(String name, double commissionRate, double monthSales) {
		super(name);
		this.commissionRate = commissionRate;
		this.monthSales = monthSales;
	}

	public double getCommissionRate() {
		return commissionRate;
	}

	public void setCommissionRate(double commissionRate) {
		this.commissionRate = commissionRate;
	}

	public double getMonthSales() {
		return monthSales;
	}

	public void setMonthSales(double monthSales) {
		this.monthSales = monthSales;
	}

	public double earnings() {
		return (1+getCommissionRate()/100) * getMonthSales();
	}

	@Override
	public String toString() {
		return "SalesCommisioned [commissionRate=" + commissionRate + ", monthSales=" + monthSales + "]";
	}
}

public class Executive extends SalesCommisioned{

	private double incrementPercentage;

	public Executive(String name, double commissionRate, double monthSales, double incrementPercentage) {
		super(name, commissionRate, monthSales);
		this.incrementPercentage = incrementPercentage;
	}

	public double getIncrement() {
		return incrementPercentage;
	}

	public void setIncrement(double incrementPercentage) {
		this.incrementPercentage = incrementPercentage;
	}

	public double annualSalary() {
		return super.earnings()*12;
	}

	public double earningsAnnual() {
		return (1+incrementPercentage/100) * annualSalary();
	}

	@Override
	public String toString() {
		return "Executive [increment=" + incrementPercentage + "]";
	}
}

import java.util.ArrayList;
import java.util.List;

public class TestEmployee {

	public static void main(String[] args) {
		// TODO Auto-generated method stub


		List<Object> emps= new ArrayList<Object>();

		int i = 0;

		HourlyPaid hourlyPaid = new HourlyPaid( "Anne Bronte", 7.5, 45);
		SalesCommisioned salesCommisioned = new SalesCommisioned("Emily Bronte", 30, 90);
		Executive exective = new Executive("Charlotte Bronte", 12, 123, 30);

		emps.add(i, hourlyPaid);
		i++;
		emps.add(i, salesCommisioned);
		i++;
		emps.add(i, exective);
		i++;

		for ( Object currentEmp : emps ) {

			System.out.println( currentEmp );

			if( currentEmp instanceof HourlyPaid ) {

				HourlyPaid employee = ( HourlyPaid ) currentEmp;
				System.out.println("HourlyPaid Employee : " + employee.getName());
				System.out.println("Hourly Wage : " + employee.getWage());
				System.out.println("Earned(A Month) : " + employee.earnings());

				System.out.println();


		    }else if ( currentEmp instanceof SalesCommisioned ) {

				SalesCommisioned employee = ( SalesCommisioned ) currentEmp;
				System.out.println("SalesCommisioned Employee : " + employee.getName());
				System.out.println("Commisioned Rate : " + employee.getCommissionRate() + "%");
				System.out.println("MonthSales : " + employee.getMonthSales());
				System.out.println("Earned(A Month) : " + employee.earnings());

				System.out.println();

		    }

			if ( currentEmp instanceof Executive ){

				Executive employee = ( Executive ) currentEmp;

				System.out.println("AnnualSalay is " + employee.annualSalary() + " with IncrementRate " + employee.getIncrement() + "%");
				System.out.println("Earned(A year) : " + employee.earningsAnnual());

				System.out.println();
			}
		}
	}
}

ここまでの実行結果

HourlyPaid [wage=7.5, hours=45.0]
HourlyPaid Employee : Anne Bronte
Hourly Wage : 7.5
Earned(A Month) : 346.875

SalesCommisioned [commissionRate=30.0, monthSales=90.0]
SalesCommisioned Employee : Emily Bronte
Commisioned Rate : 30.0%
MonthSales : 90.0
Earned(A Month) : 117.0

Executive [increment=30.0]
SalesCommisioned Employee : Charlotte Bronte
Commisioned Rate : 12.0%
MonthSales : 123.0
Earned(A Month) : 137.76000000000002

AnnualSalay is 1653.1200000000003 with IncrementRate 30.0%
Earned(A year) : 2149.0560000000005

単体テストのファイル

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

class UnitTest {
	private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
	@Before
    public void setUpStreams() {
		System.setOut(new PrintStream(outContent));
	}

	@After
    public void cleanUpStreams() {
        System.setOut(System.out);
    }
	@Test
    public void oilingTest01() {

		List<Object> emps= new ArrayList<Object>();

		int i = 0;

		HourlyPaid hourlyPaid = new HourlyPaid( "Anne Bronte", 7.5, 45);
		SalesCommisioned salesCommisioned = new SalesCommisioned("Emily Bronte", 30, 90);
		Executive exective = new Executive("Charlotte Bronte", 12, 123, 30);

		emps.add(i, hourlyPaid);
		i++;
		emps.add(i, salesCommisioned);
		i++;
		emps.add(i, exective);
		i++;

		for ( Object currentEmp : emps ) {

			System.out.println( currentEmp );

			if( currentEmp instanceof HourlyPaid ) {

				HourlyPaid employee = ( HourlyPaid ) currentEmp;
				System.out.println("HourlyPaid Employee : " + employee.getName());
				System.out.println("Hourly Wage : " + employee.getWage());
				System.out.println("Earned(A Month) : " + employee.earnings());

				System.out.println();


		    }else if ( currentEmp instanceof SalesCommisioned ) {

				SalesCommisioned employee = ( SalesCommisioned ) currentEmp;
				System.out.println("SalesCommisioned Employee : " + employee.getName());
				System.out.println("Commisioned Rate : " + employee.getCommissionRate() + "%");
				System.out.println("MonthSales : " + employee.getMonthSales());
				System.out.println("Earned(A Month) : " + employee.earnings());

				System.out.println();

		    }

			if ( currentEmp instanceof Executive ){

				Executive employee = ( Executive ) currentEmp;

				System.out.println("AnnualSalay is " + employee.annualSalary() + " with IncrementRate " + employee.getIncrement() + "%");
				System.out.println("Earned(A year) : " + employee.earningsAnnual());

				System.out.println();
			}
		}
    }

	/*
	//Exective Class
	@Test
	void getIncrement() {
		fail("Not yet implemented");
	}
	/*
	@Test
	void earningsAnnual(){
		fail("Not yet implemented");
	}
	@Test
	void annualSalary() {
		fail("Not yet implemented");
	}
	*/

	/*
	@Test
	void earings() {
		fail("Not yet implemented");
	}

	@Test
	void getName() {
		fail("Not yet implemented");
	}
	@Test
	void getWage() {
		fail("Not yet implemented");
	}
	@Test
	void getCommisionRate() {
		fail("Not yet implemented");
	}
	*/
}

Answer 1

public abstract class Employee {

	private String name;

	public Employee(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Employee [name=" + name + "]";
	}

	@Override
	public boolean equals(Object arg0) {
		Employee other = (Employee) arg0;
		return this.getName().equalsIgnoreCase(other.getName());
	}



}

public class Executive extends SalesCommisioned{

	private double incrementPercentage;

	public Executive(String name, double commissionRate, double monthSales, double incrementPercentage) {
		super(name, commissionRate, monthSales);
		this.incrementPercentage = incrementPercentage;
	}

	public double getIncrement() {
		return incrementPercentage;
	}

	public void setIncrement(double incrementPercentage) {
		this.incrementPercentage = incrementPercentage;
	}

	public double annualSalary() {
		return super.earnings()*12;
	}

	public double earningsAnnual() {
		return (1+incrementPercentage/100) * annualSalary();
	}

	@Override
	public String toString() {
		return "Executive [increment=" + incrementPercentage + "]";
	}

	@Override
	public boolean equals(Object arg0) {
		Employee other = (Employee) arg0;
		return this.getName().equalsIgnoreCase(other.getName());
	}


}

public class SalesCommisioned extends Employee{

	private double commissionRate; // commission percentage
	private double monthSales; // gross monthly sales

	public SalesCommisioned(String name, double commissionRate, double monthSales) {
		super(name);
		this.commissionRate = commissionRate;
		this.monthSales = monthSales;
	}

	public double getCommissionRate() {
		return commissionRate;
	}

	public void setCommissionRate(double commissionRate) {
		this.commissionRate = commissionRate;
	}

	public double getMonthSales() {
		return monthSales;
	}

	public void setMonthSales(double monthSales) {
		this.monthSales = monthSales;
	}

	public double earnings() {
		return (1+getCommissionRate()/100) * getMonthSales();
	}

	@Override
	public String toString() {
		return "SalesCommisioned [commissionRate=" + commissionRate + ", monthSales=" + monthSales + "]";
	}

	@Override
	public boolean equals(Object arg0) {
		Employee other = (Employee) arg0;
		return this.getName().equalsIgnoreCase(other.getName());
	}


}

public class HourlyPaid extends Employee{

	public double wage;//wage per hour
	public double hours;//total hours in a week


	public HourlyPaid(String name, double wage, double hours) {
		super(name);
		this.wage = wage;
		this.hours = hours;
	}


	public double getWage() {
		return wage;
	}


	public void setWage(double wage) {
		this.wage = wage;
	}


	public double getHours() {
		return hours;
	}


	public void setHours(double hours) {
		this.hours = hours;
	}


	public double earnings() {
		if (getHours() <= 40) {//Not Overworked
			return getHours()*getWage();
		}
		//If it is more than 40 hours per week in Japan, hourly paid must times "1.25"
		else return getWage()*40 + getWage()*1.25*(getHours()-40);
	}


	@Override
	public String toString() {
		return "HourlyPaid [wage=" + wage + ", hours=" + hours + "]";
	}

	@Override
	public boolean equals(Object arg0) {
		Employee other = (Employee) arg0;
		return this.getName().equalsIgnoreCase(other.getName());
	}


}

import java.util.ArrayList;
import java.util.List;

public class TestEmployee {

	public static void main(String[] args) {
		// TODO Auto-generated method stub


		List<Object> emps= new ArrayList<Object>();

		int i = 0;

		HourlyPaid hourlyPaid = new HourlyPaid( "Anne Bronte", 7.5, 45);
		SalesCommisioned salesCommisioned = new SalesCommisioned("Emily Bronte", 30, 90);
		Executive exective = new Executive("Charlotte Bronte", 12, 123, 30);

		emps.add(i, hourlyPaid);
		i++;
		emps.add(i, salesCommisioned);
		i++;
		emps.add(i, exective);
		i++;

		for ( Object currentEmp : emps ) {

			System.out.println( currentEmp );

			if( currentEmp instanceof HourlyPaid ) {

				HourlyPaid employee = ( HourlyPaid ) currentEmp;
				System.out.println("HourlyPaid Employee : " + employee.getName());
				System.out.println("Hourly Wage : " + employee.getWage());
				System.out.println("Earned(A Month) : " + employee.earnings());

				System.out.println();


		    }else if ( currentEmp instanceof SalesCommisioned ) {

				SalesCommisioned employee = ( SalesCommisioned ) currentEmp;
				System.out.println("SalesCommisioned Employee : " + employee.getName());
				System.out.println("Commisioned Rate : " + employee.getCommissionRate() + "%");
				System.out.println("MonthSales : " + employee.getMonthSales());
				System.out.println("Earned(A Month) : " + employee.earnings());

				System.out.println();

		    }

			if ( currentEmp instanceof Executive ){

				Executive employee = ( Executive ) currentEmp;

				System.out.println("AnnualSalay is " + employee.annualSalary() + " with IncrementRate " + employee.getIncrement() + "%");
				System.out.println("Earned(A year) : " + employee.earningsAnnual());

				System.out.println();
			}
		}
	}
}

import org.junit.Assert;
import org.junit.Test;

public class UnitTest {

	@Test
	public void testEquals() {
		HourlyPaid hp = new HourlyPaid("TestHP", 10, 10);
		SalesCommisioned sc = new SalesCommisioned("TestSC", 20, 20);
		Executive ex = new Executive("TestEX", 30, 30, 30);

		//HourlyPaid Test
		hp.getName();
		hp.getWage();
		hp.getHours();
		hp.earnings();
		hp.toString();

		//SalesCommisioned Test
		sc.getName();
		sc.getCommissionRate();
		sc.getMonthSales();
		sc.earnings();

		//Executive Test
		ex.getName();
		ex.getIncrement();
		ex.annualSalary();
		ex.earningsAnnual();
		ex.toString();

		//Check 1st parameter is「Expected Value」, 2nd parameter is「Actual Value」
		//So need to set same value and check
		HourlyPaid hp2 = new HourlyPaid("TestHP", 10, 10);
		SalesCommisioned sc2 = new SalesCommisioned("TestSC", 20, 20);
		Executive ex2 = new Executive("TestEX", 30, 30, 30);
		Assert.assertEquals(true, hp.equals(hp2));
		Assert.assertEquals(true, sc.equals(sc2));
		Assert.assertEquals(true, ex.equals(ex2));

	}

}