add tests

test/runtime/samples/spread-element-class/main.svelte

@@ -2,4 +2,4 @@
 	export let blah = 'hello';
 </script>
 
-<div class='foo' class:bar={true} {...{}}>{blah}</div>
+<div class:bar={true} {...{ class: 'foo' }}>{blah}</div>

test/runtime/samples/spread-element-scope/_config.js

@@ -0,0 +1,7 @@
+export default {
+	html: `
+		<div class="foo svelte-xg5rbo">red</div>
+		<div class="qux svelte-xg5rbo">red</div>
+		<div class="bar svelte-xg5rbo">red and bold</div>
+	`
+};

test/runtime/samples/spread-element-scope/main.svelte

@@ -0,0 +1,10 @@
+<style>
+	div { color: red; }
+	.bar { font-weight: bold; }
+</style>
+
+<div {...{ class: 'bar' }} class='foo'>red</div>
+
+<div class='foo' {...{ class: 'qux' }}>red</div>
+
+<div {...{ class: 'bar' }}>red and bold</div>