public void testAsBoolean() throws JaxenException, DocumentException
{
XPath xpath = new Dom4jXPath( "/root/a = 'a'" );
SAXReader reader = new SAXReader();
Document doc = reader.read( "xml/simple.xml" );
boolean answer = xpath.booleanValueOf( doc );
assertTrue( "Xpath worked: " + xpath, answer );
xpath = new Dom4jXPath( "'a' = 'b'" );
answer = xpath.booleanValueOf( doc );
assertTrue( "XPath should return false: " + xpath, ! answer );
}