add more test

test/runtime/samples/attribute-boolean-itemscope/_config.js

@@ -0,0 +1,11 @@
+export default {
+	props: {
+		itemscope: true
+	},
+	test({ assert, target, component }) {
+		const div = target.querySelector('div');
+		assert.ok(div.itemscope);
+		component.itemscope = false;
+		assert.ok(!div.itemscope);
+	}
+};

test/runtime/samples/attribute-boolean-itemscope/main.svelte

@@ -0,0 +1,5 @@
+<script>
+export let itemscope;
+</script>
+
+<div {itemscope}  />