tweak to iframe lazy load test

test/test.html

@@ -44,7 +44,6 @@
 							<li class="fragment">4.2</li>
 							<li class="fragment">4.3</li>
 						</ul>
-						<iframe data-src="http://example.com"></iframe>
 					</section>
 
 					<section>
@@ -53,6 +52,7 @@
 							<li class="fragment" data-fragment-index="0">4.1</li>
 							<li class="fragment" data-fragment-index="0">4.2</li>
 						</ul>
+						<iframe data-src="http://example.com"></iframe>
 					</section>
 
 					<section>

test/test.js

@@ -498,9 +498,9 @@ Reveal.addEventListener( 'ready', function() {
 	test( 'iframe with data-src', function() {
 		Reveal.slide( 0, 0 );
 		strictEqual( document.querySelectorAll( '.reveal section iframe[src]' ).length, 0, 'Iframe source is not set' );
-		Reveal.slide( 2, 0 );
-		strictEqual( document.querySelectorAll( '.reveal section iframe[src]' ).length, 1, 'Iframe source is set' );
 		Reveal.slide( 2, 1 );
+		strictEqual( document.querySelectorAll( '.reveal section iframe[src]' ).length, 1, 'Iframe source is set' );
+		Reveal.slide( 2, 2 );
 		strictEqual( document.querySelectorAll( '.reveal section iframe[src]' ).length, 0, 'Iframe source is not set' );
 	});