ParamertizedTest.java

package com.levelup.java.junit;

import static org.junit.Assert.assertEquals;

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

import org.apache.log4j.Logger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/**
 * This java example will demonstrate junits
 * parameterized tests.  Paramertized tests are useful when you
 * are interested in running the same test with different test data.
 * 
 * @author Justin Musgrove
 * @see <a href='http://www.leveluplunch.com/java/examples/junit-parameterized-test/'>Junit Paramertized Test</a>
 * 
 */
@RunWith(Parameterized.class)
public class ParamertizedTest {
	
	private static final Logger logger = Logger.getLogger(ParamertizedTest.class);

	static class Calculator {

		public static int add(int a, int b) {
			return a + b;
		}
	}

	@Parameters
	public static Collection<Object[]> data() {
		return Arrays.asList(new Object[][] {
				{0, 0, 0},
				{1, 0, 1},
				{0, 1, 1},
				{1, 1, 2},
				{1, 2, 3}, 
				{2, 1, 3}
			});
	}

	private int a;
	private int b;
	private int expected;
	
	public ParamertizedTest(int a, int b, int expected) {
		this.a = a;
		this.b = b;
		this.expected = expected;
	}
	
	@Test
	public void test_calculator_add () {
		
		logger.info("a=" + a + " b " + b + " = c " + expected);
		
		int calculatedValue = Calculator.add(a,  b);
		assertEquals(expected, calculatedValue);
	}	
	
}