revise simple.md so that slide 1.1 and 1.2 correctly break into separate slides

test/simple.md

@@ -4,7 +4,9 @@
 var a = 1;
 ```
 
+
 ## Slide 1.2
 
 
+
 ## Slide 2

test/test-markdown-external.js

@@ -7,7 +7,12 @@ Reveal.addEventListener( 'ready', function() {
 	test( 'Vertical separator', function() {
 		strictEqual( document.querySelectorAll( '.reveal .slides>section>section' ).length, 2, 'found two slides' );
 	});
-	test( 'language highlighter', function() {
+
+	test( 'Horizontal separator', function() {
+		strictEqual( document.querySelectorAll( '.reveal .slides>section' ).length, 2, 'found two slides' );
+	});
+
+	test( 'Language highlighter', function() {
 		strictEqual( document.querySelectorAll( '.hljs-keyword' ).length, 1, 'got rendered highlight tag.' );
 		strictEqual( document.querySelector( '.hljs-keyword' ).innerHTML, 'var', 'the same keyword: var.' );
 	});