HtmlUnit's documentation doesn't make it abundantly clear how to run assertions against an HTML string snippet (i.e. the easiest way to run tests when you don't care about URLs, network connections, etc.)

HtmlUnitPageFromString.java

private HtmlPage getPage(String html) {
	MockWebConnection webConnection = new MockWebConnection();
	webConnection.setDefaultResponse(html);
	WebClient webClient = new WebClient();
	webClient.setWebConnection(webConnection);
	try {
		return webClient.getPage("http://blah");
	} catch (Exception e) {
		throw new RuntimeException(e);
	}
}