Testcase for Issue 169 in XMLUnit for Java

Issue169.java

import org.xmlunit.builder.*;
import org.xmlunit.diff.*;

/**
 * @see "https://github.com/xmlunit/xmlunit/issues/169"
 */
public class Issue169 {

    private static final String X1 = "<Data:Keys xmlns:Data=\"foo\">\n"
        + "<Data:Value Key=\"1\" Name=\"Example1\" />\n"
        + "<Data:Value Key=\"2\" Name=\"Example2\" />\n"
        + "<Data:Value Key=\"3\" Name=\"Example3\" />\n"
        + "</Data:Keys>";
    private static final String X2 = "<Data:Keys xmlns:Data=\"foo\">\n"
        + "<Data:Value Key=\"2\" Name=\"Example2\" />\n"
        + "<Data:Value Key=\"1\" Name=\"Example1\" />\n"
        + "<Data:Value Key=\"3\" Name=\"Example3\" />\n"
        + "</Data:Keys>";   
    public static void main(String[] args) {
        Diff diff = DiffBuilder.compare(Input.from(X1))
            .withTest(Input.from(X2))
            .ignoreComments()
            .ignoreWhitespace()
            .normalizeWhitespace()
            .checkForSimilar()
            .withNodeMatcher(new DefaultNodeMatcher(ElementSelectors.conditionalBuilder()
                .whenElementIsNamed("Value")
                .thenUse(ElementSelectors.byNameAndAttributes("Key"))
                .elseUse(ElementSelectors.byName)
                .build()
             )).build()
            ;
        System.err.println(diff);
    }
}