work around Svelte hydration failures

test/app/routes/index.html

@@ -13,6 +13,8 @@
 	<p><strong>Try editing this file (routes/index.html) to test hot module reloading.</strong></p>
 </Layout>
 
+<div class='hydrate-test'></div>
+
 <style>
 	h1, figure, p {
 		text-align: center;

test/common/test.js

@@ -317,13 +317,13 @@ function run(env) {
 
 			it('hydrates initial route', () => {
 				return nightmare.goto(base)
-					.wait('h1')
+					.wait('.hydrate-test')
 					.evaluate(() => {
-						window.h1 = document.querySelector('h1');
+						window.el = document.querySelector('.hydrate-test');
 					})
 					.init().wait(100)
 					.evaluate(() => {
-						return document.querySelector('h1') === window.h1;
+						return document.querySelector('.hydrate-test') === window.el;
 					})
 					.then(matches => {
 						assert.ok(matches);