A CasperJS test case to determine if Reddit has cats on its front page or not.

are_there_cats_reddit.js

// Your test cases begin in here.
casper.test.begin("Reddit Top Links Tests", 1, function(test) {
	// Your first test case starts here.
	casper.start("http://reddit.com/", function() {
		// In here, we have access to the website's (reddit's) DOM!
		/*
			So what we're doing is selecting all the entry links,
			and then extracting their text, and then filtering
			the link's text based on if they have the word "cat"
			or not.
		*/
		links = document.querySelectorAll(".entry p a");
		links = Array.prototype.map.call(links, function(el) {
			return el.childNodes[0].data;
		});
		links = links.filter(function(el) {
			return (el.indexOf("cat") >= 0);
		});

		// We check to see if we have any cat-related links. If we do the test case passes!
		test.assertEquals(links.length > 0, true, "Meowston we have cats!!!");
	});

	// This is how you run the test cases.
	casper.run(function() {
		test.done();
	});
});