JUnit parameterized test

The parameterized test is a new feature introduced in JUnit 4. It provides the facility to execute the same test case again and again with different values.

Steps to create a parameterized test:

1. Test class have to be annotated with @RunWith(Parameterized.class) annotation.

2. Create a public static method with @Parameters annotation which returns a collection of objects as test data set.

3. Create data members for each column of test data set.

4. Create a public constructor which takes one object of test data set.

5. Create test case using test data set.

Example:

DivisionTestCase.java

import java.util.Arrays;
import java.util.Collection;
import com.javawithease.business.*;
import org.junit.Before;
import org.junit.Test;
import org.junit.runners.Parameterized;
import org.junit.runner.RunWith;
import static org.junit.Assert.assertEquals;
 
/**
 * This is test case class for parameterised test case.
 * @author javawithease
 */
@RunWith(Parameterized.class)
public class DivisionTestCase {
  private int num1;
  private int num2;
  private int expectedResult;
  private DivisionTest divisionTest;
 
  //Constructor that takes test data.
  public DivisionTestCase(int num1, int num2, 
    int expectedResult){
   this.num1 = num1;
   this.num2 = num2;
   this.expectedResult = expectedResult;
  }
 
  //called before every test case.
  @Before
  public void initializeDivisionTest

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