[test] error redirections

.changeset/shaggy-radios-rush.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+error pages can now redirect

packages/kit/test/apps/basics/src/routes/__error.svelte

@@ -1,6 +1,13 @@
 <script context="module">
 	/** @type {import('@sveltejs/kit').ErrorLoad} */
 	export function load({ status, error }) {
+		if (error && error.message.includes('/redirect/nowhere')) {
+			return {
+				status: 307,
+				redirect: '/redirect/c'
+			};
+		}
+
 		return {
 			props: { status, error }
 		};

packages/kit/test/apps/basics/src/routes/redirect/_tests.js

@@ -47,4 +47,32 @@ export default function (test, is_dev) {
 			'This is your custom error page saying: ""redirect" property returned from load() must be accompanied by a 3xx status code"'
 		);
 	});
+
+	test('serves redirection on error', '/redirect/crashing', async ({ base, page }) => {
+		assert.equal(await page.url(), `${base}/redirect/c`);
+		assert.equal(await page.textContent('h1'), 'c');
+	});
+
+	test('navigates to redirection on error', '/redirect', async ({ base, page, clicknav }) => {
+		await clicknav('[href="/redirect/crashing"]');
+
+		assert.equal(await page.url(), `${base}/redirect/c`);
+		assert.equal(await page.textContent('h1'), 'c');
+	});
+
+	test('serves redirection on missing page', '/redirect/nowhere', async ({ base, page }) => {
+		assert.equal(await page.url(), `${base}/redirect/c`);
+		assert.equal(await page.textContent('h1'), 'c');
+	});
+
+	test(
+		'navigates to redirection on missing page',
+		'/redirect',
+		async ({ base, page, clicknav }) => {
+			await clicknav('[href="/redirect/nowhere"]');
+
+			assert.equal(await page.url(), `${base}/redirect/c`);
+			assert.equal(await page.textContent('h1'), 'c');
+		}
+	);
 }

packages/kit/test/apps/basics/src/routes/redirect/crashing/__error.svelte

@@ -0,0 +1,11 @@
+<script context="module">
+	/** @type {import('@sveltejs/kit').ErrorLoad} */
+	export async function load() {
+		return {
+			status: 307,
+			redirect: './c'
+		};
+	}
+</script>
+
+<h1>Redirecting error page</h1>

packages/kit/test/apps/basics/src/routes/redirect/crashing/index.svelte

@@ -0,0 +1,7 @@
+<script context="module">
+	export async function load() {
+		throw new Error('oopsie');
+	}
+</script>
+
+<h1>Crashing page</h1>

packages/kit/test/apps/basics/src/routes/redirect/index.svelte

@@ -6,4 +6,7 @@
 <a href="/redirect/loopy/b">b (loopy)</a>
 
 <a href="/redirect/missing-status/a">a (missing-status)</a>
-<a href="/redirect/missing-status/b">b (missing-status)</a>
+<a href="/redirect/missing-status/b">b (missing-status)</a>
+
+<a href="/redirect/crashing">crashing</a>
+<a href="/redirect/nowhere">nowhere</a>