add test

Author: Rich-Harris

packages/svelte/tests/runtime-runes/samples/async-error-skipped/_config.js

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+import { flushSync, tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target }) {
+		await Promise.resolve();
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<h1>a</h1>
+				<button>a</button>
+				<button>b</button>
+				<button>c</button>
+				<button>ok</button>
+				<p>a</p>
+			`
+		);
+
+		const [a, b, c, ok] = target.querySelectorAll('button');
+
+		flushSync(() => b.click());
+		await Promise.resolve();
+		await Promise.resolve();
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<h1>c</h1>
+				<button>a</button>
+				<button>b</button>
+				<button>c</button>
+				<button>ok</button>
+				<p>c</p>
+			`
+		);
+
+		flushSync(() => ok.click());
+
+		flushSync(() => b.click());
+		await Promise.resolve();
+		await Promise.resolve();
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<h1>b</h1>
+				<button>a</button>
+				<button>b</button>
+				<button>c</button>
+				<button>ok</button>
+				<p>b</p>
+			`
+		);
+	}
+});

packages/svelte/tests/runtime-runes/samples/async-error-skipped/main.svelte

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+<script lang=ts>
+	let route = $state('a');
+	let ok = $state(false);
+
+	function goto(r) {
+		return Promise.resolve().then(() => {
+			route = r;
+			throw new Error('nope');
+		});
+	}
+</script>
+
+<h1>{route}</h1>
+<button onclick={() => route = 'a'}>a</button>
+<button onclick={() => route = 'b'}>b</button>
+<button onclick={() => route = 'c'}>c</button>
+<button onclick={() => ok = true}>ok</button>
+
+<svelte:boundary>
+	{#if route === 'a'}
+		<p>a</p>
+	{/if}
+
+	{#if route === 'b'}
+		{#if ok}
+			<p>b</p>
+		{:else}
+			{await goto('c')}
+		{/if}
+	{/if}
+
+	{#if route === 'c'}
+		<p>c</p>
+	{/if}
+
+	{#snippet pending()}
+		<p>pending...</p>
+	{/snippet}
+
+	{#snippet failed(error, reset)}
+		<button onclick={reset}>retry</button>
+	{/snippet}
+</svelte:boundary>