Calculator.java

package edu.univDhaka.iit.CalculatorMain;

public class Calculator {

  public int add(int a, int b){
		return a+b;
	}
	
	public int subtract(int a, int b){
		return a-b;
	}
	
	public int multiple(int a, int b){
		return a*b;
	}
	
	public float divide(int a, int b){
		return a/b;
	}
	
	public float squireRoot(float a){
		return (float)Math.sqrt(a);
	}
	
	public float remainder(int a, int b){
		return a%b;
	}
	
	public double power(double a, double b){
		return Math.pow(a, b);
	}
	
}

CalculatorTest.java

package edu.univDhaka.iit.CalculatorTesting;

import static org.junit.Assert.*;
import junit.framework.Assert;

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

import edu.univDhaka.iit.CalculatorMain.Calculator;


public class CalculatorTest {
  
	private Calculator calculator;

	@Before
	public void setUp() throws Exception {
		calculator = new Calculator();
	}
	
	@Test
	public void testAdd() {
		int a = 10;
		int b = 15;
		int result = 25;
		
		Assert.assertEquals(result, calculator.add(a, b));
	}
	
	@Test
	public void testSubtract(){
		int a = 100;
		int b = 50;
		int result = 50;
		
		Assert.assertEquals(result, calculator.subtract(a, b));
	}
	
	@Test
	public void testMultiple(){
		int a = 5;
		int b = 5;
		int result = 25;
		
		Assert.assertEquals(result, calculator.multiple(a, b));
	}
	
	@Test
	public void testDivide(){
		int a = 25;
		int b = 5;
		float result = (float) 5.0;
		
		Assert.assertEquals(result, calculator.divide(a, b));
	}
	
	@Test
	public void testPower(){
		int a = 5;
		int b = 2;
		double result = 25.0;
		
		Assert.assertEquals(result, calculator.power(a, b));
	}
	
	@Test
	public void testRemainder(){
		int a = 26;
		int b = 5;
		float result = (float) 1.0;
		
		Assert.assertEquals(result, calculator.remainder(a, b));
	}
	
	@Test
	public void testSquireRoot(){
		float a = 25;
		float result = 5;
		
		Assert.assertEquals(result, calculator.squireRoot(a));
	}
	

}