AccessPrivatePartsTest.java

/**
 * Copyright 2011 Marin Solutions
 */
package com.captaindebug;

import static org.junit.Assert.assertEquals;

import java.util.regex.Pattern;

import org.junit.Before;
import org.junit.Test;
import org.powermock.reflect.Whitebox;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Demonstrate the use of the PowerMock WhiteBox class, that breaks an object's encapsulation in the names of testing
 * 
 * @author Roger
 * 
 */
public class AccessPrivatePartsTest {

	private static final Logger logger = LoggerFactory.getLogger(AccessPrivatePartsTest.class);

	private AnchorTag instance;

	@Before
	public void setUp() throws Exception {

		instance = new AnchorTag();
	}

	/**
	 * Call the private createNewTag method
	 */
	@Test
	public void callPrivateMethodTest() throws Exception {

		String result = Whitebox.<String> invokeMethod(instance, "createNewTag", "www.captaindebug.com", "The Blog");

		logger.info("Called 'createNewTag' with result: " + result);
		assertEquals("<a href=\"www.captaindebug.com\">The Blog</a>", result);
	}

	/**
	 * Works for private instance vars. Does not work for static vars.
	 */
	@Test
	public void accessPrivateInstanceVarTest() throws Exception {

		Pattern result = Whitebox.<Pattern> getInternalState(instance, "pattern");

		logger.info("Broke encapsulation to get hold of state: " + result.pattern());
		assertEquals("^([a-zA-Z0-9]([a-zA-Z0-9\\-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,6}$", result.pattern());
	}
}