Tone.js/test/helper/LoadHTML.js

define(["Tone/core/Tone", "Tone/core/Offline", "helper/BufferTest", "Tone/core/Master"], function(Tone, Offline, BufferTest, Master){

	function getIframeError(url){
		return new Promise(function(success, error){
			var iframe = document.createElement("iframe");
			iframe.onload = function(){
				iframe.remove();
				success();
			};
			iframe.width = 1;
			iframe.height = 1;
			iframe.src = url;
			document.body.appendChild(iframe);
			//capture the error
			iframe.contentWindow.onerror=function(e){
				error(e);
			};
		});
	}

	function createTest(url){

		it(url, function(){
			url = baseUrl + url + ".html";
			return testUrl(url).then(getIframeError);
		});
	}

	function testUrl(url){
		return new Promise(function(success, fail){
			var httpRequest = new XMLHttpRequest();
			httpRequest.onreadystatechange = function(){
				if (httpRequest.readyState === 4){
					if (httpRequest.status === 200){
						success(url);
					} else {
						fail("404: "+url);
					}
				}
			};
			httpRequest.open("GET", url);
			httpRequest.send();
		});
	}

	/**
	 * @param  {String} url 
	 * @return {Promise}     
	 */
	return function(url){
		return testUrl(url).then(getIframeError);
	};
});