test update while yield fragment is torn down, and tweak code for consistency

test/compiler/component-yield-if/Widget.html

@@ -3,13 +3,13 @@
 		{{yield}}
 	{{/if}}
 </p>
+
 <script>
 	export default {
-    data(){
+		data () {
 			return {
 				show: false
 			}
 		}
-  }
+	};
-
 </script>

test/compiler/component-yield-if/_config.js

@@ -1,13 +1,24 @@
 export default {
 	html: '<div><p></p></div>',
+
 	test ( assert, component, target ) {
 		const widget = component.refs.widget;
+
 		assert.equal( widget.get( 'show' ), false );
+
 		widget.set({show: true});
-		assert.equal( target.innerHTML, '<div><p>Hello<!--yield--><!--#if show--></p></div>' );
+		assert.htmlEqual( target.innerHTML, '<div><p>Hello</p></div>' );
+
 		component.set({data: 'World'});
-		assert.equal( target.innerHTML, '<div><p>World<!--yield--><!--#if show--></p></div>' );
+		assert.htmlEqual( target.innerHTML, '<div><p>World</p></div>' );
+
 		widget.set({show: false});
-		assert.equal( target.innerHTML, '<div><p><!--#if show--></p></div>' );
+		assert.htmlEqual( target.innerHTML, '<div><p></p></div>' );
+
+		component.set({data: 'Goodbye'});
+		assert.htmlEqual( target.innerHTML, '<div><p></p></div>' );
+
+		widget.set({show: true});
+		assert.htmlEqual( target.innerHTML, '<div><p>Goodbye</p></div>' );
 	}
-}
+};