XPath in a JUnit test

• On top of javax.xml.xpath

• Bundled with Java 1.5; a standard extension for Java 1.4 and earlier

• There are other frameworks you could use

import org.xml.sax.InputSource;
import javax.xml.xpath.*;

import junit.framework.*;
import java.io.*;

public class PListXPathTest extends TestCase {

  private InputSource plist;
  private XPath query;
  
  protected void setUp() throws IOException {
    plist = new InputSource(new FileInputStream("thunderbirdplist.xml"));    
    query = XPathFactory.newInstance().newXPath();
  }
  
  public void testNoTwoKeyElementsAreAdjacent() 
    throws XPathExpressionException {
     // //key/following-sibling::*[1]/self::key is empty
     
     Boolean result = (Boolean) query.evaluate(
     "//key/following-sibling::*[1]/self::key", 
     plist, XPathConstants.BOOLEAN);
     assertFalse(result.booleanValue());
    
  }

}