How to parameterize test in junit with example


The custom runner Parameterized implements parameterized tests. When running a parameterized test class, instances are created for the cross-product of the test methods and the test data elements.

 how to convert array to list in java ?

package myWorkjUnit;

import java.util.Arrays;
import java.util.List;

public class ArrayToList {
 public static void main(String[] argv) {

 String sArray[] = new String []{"Array A", "Array B", "Array C"};

 //convert array to list
 List<String> lList = Arrays.asList(sArray);




package myWorkjUnit;

import java.util.Arrays;
import java.util.Collection;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/*Structure of a parameterized test class

1. A static method that generates and returns test data,
2. A single constructor that stores the test data, and
3. A test.

@RunWith(value = Parameterized.class)
public class ParameterizedTestExample {
 private int number1;

 * Constructor.
 * The JUnit test runner will instantiate this class once for every
 * element in the Collection returned by the method annotated with
 * @Parameters.

 public ParameterizedTestExample(int number) {
 this.number1 = number;

 * Test data generator.
 * This method is called the the JUnit parameterized test runner and
 * returns a Collection of Arrays. For each Array in the Collection,
 * each array element corresponds to a parameter in the constructor.
 public static Collection<Object[]> data() {

// In this example, the parameter generator returns a List of
// arrays. Each array has two elements: { datum, expected }.
// These data are hard-coded into the class, but they could be
// generated or loaded in any way you like.
 Object[][] data = new Object[][] { { 1 }, { 2 }, { 3 }, { 4 } };

 //convert array to list
 return Arrays.asList(data);

 * The test.
 * This test method is run once for each element in the Collection returned
 * by the test data generator -- that is, every time this class is
 * instantiated. Each time this class is instantiated, it will have a
 * different data set, which is available to the test method through the
 * instance's fields.
 public void pushTest() {
 System.out.println( "Parameterized Number is : " + number1);

Parameterized Number is : 1
Parameterized Number is : 2
Parameterized Number is : 3
Parameterized Number is : 4












Parameterized (JUnit API)

Link 1 Link 2 Link 3 Link 4 Link 5


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