public void doesNotExistNonMatch() throws IOException, AssertionError {
XPathExpectationsHelper helper = new XPathExpectationsHelper("//a");
WebServiceMessageMatcher matcher = helper.doesNotExist();
assertNotNull(matcher);
WebServiceMessage message = createMock(WebServiceMessage.class);
expect(message.getPayloadSource()).andReturn(new StringSource("<a><b/></a>")).times(2);
replay(message);
matcher.match(message);
}