add a test but skip it for now

test/runtime/samples/store-auto-subscribe-in-each/_config.js

@@ -0,0 +1,40 @@
+import { writable } from '../../../../store.js';
+
+export default {
+	skip: true,
+
+	props: {
+		things: [
+			writable('a'),
+			writable('b'),
+			writable('c')
+		]
+	},
+
+	html: `
+		<button>a</button>
+		<button>b</button>
+		<button>c</button>
+	`,
+
+	async test({ assert, component, target, window }) {
+		const buttons = target.querySelectorAll('button');
+		const click = new window.MouseEvent('click');
+
+		await buttons[1].dispatchEvent(click);
+
+		assert.htmlEqual(target.innerHTML, `
+			<button>a</button>
+			<button>B</button>
+			<button>c</button>
+		`);
+
+		await component.things[1].set('d');
+
+		assert.htmlEqual(target.innerHTML, `
+			<button>d</button>
+			<button>B</button>
+			<button>c</button>
+		`);
+	}
+};

test/runtime/samples/store-auto-subscribe-in-each/main.html

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+<script>
+	export let things;
+</script>
+
+{#each things as thing}
+	<button on:click="{() => thing.update(n => n.toUpperCase())}">{$thing}</button>
+{/each}