How we will provide Junit Test to our application?

• If a user is testing the functionality which was written that we have called as "UnitTesting.".
• If a programmer is testing  the code that was written other programmer it is called "Peertesting"
• Generally we will use Junit  for UnitTesting.

            STEPS for Writting Junit:
           1.)Develop our main class
                  public class Calculate
                     {
                          public int AddNumber(int i,int j){
                            return i+j;
                      }

2.Develop a test case for this class

Note:Our test case class must extends Junit.framework.Tesrcase
 Testcase class of Junit framework is having 2 life cycle methods and some Testxxx() methods.
 Note:setup(), tearDown() are called life cycle methods of Junit.

setUp():It is used for instanciation of requried resources.It is like init() .

tearDown(): It is for releasing the resources .It is similar to destroy() of servlet.

In testxxx() method we will write our logic for testing the functionality. 

• we will use fail(string s) methos to show & terminate the method.
• We will write the assertxxx() method to test the logic.
• We can also use the tail() in the catch().
• We will write the assertxxx() methods in the try block.

                                                          
              Sample Program:
 public clas MultipleTestCase extend TestCase{
  public Calculate objcalculate=null;

protected void setUp() throws Exception(){
Super.setUp();
objcalculate=new Calculate();


} 
protected void tearDown() throws Exception(){
Super.tearDown();
objcalculate=null;



} 
 
public void test multiplicationTesting(int i,int j) {

int k=10;
int p=30;
if(k==0|| p==20)
{
tail("zero is not accepted")
}
assertEquals(100,objCalculate.multipleNumber(3,6))
System.println("After  satisfing the assert equal")
}

}

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