Allow setting multiple cookies in Netlify adapter (#3092)

* Allow setting multiple cookies in Netlify adapter

* Adds a changeset

* Set the response status code

* Add a comment on why this is needed

1 files changed, 50 insertions, 0 deletions

diff --git a/packages/integrations/netlify/test/cookies.test.js b/packages/integrations/netlify/test/cookies.test.js
new file mode 100644
index 000000000..a8b304f56
--- /dev/null
+++ b/packages/integrations/netlify/test/cookies.test.js
@@ -0,0 +1,50 @@
+import { expect } from 'chai';
+import { load as cheerioLoad } from 'cheerio';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+import netlifyAdapter from '../dist/index.js';
+import { fileURLToPath } from 'url';
+
+describe('Cookies', () => {
+	/** @type {import('../../../astro/test/test-utils').Fixture} */
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/cookies/', import.meta.url).toString(),
+			experimental: {
+				ssr: true,
+			},
+			adapter: netlifyAdapter({
+				dist: new URL('./fixtures/cookies/dist/', import.meta.url),
+			}),
+			site: `http://example.com`,
+			vite: {
+				resolve: {
+					alias: {
+						'@astrojs/netlify/netlify-functions.js': fileURLToPath(
+							new URL('../dist/netlify-functions.js', import.meta.url)
+						),
+					},
+				},
+			},
+		});
+		await fixture.build();
+	});
+
+	it('Can set multiple', async () => {
+		const entryURL = new URL('./fixtures/cookies/dist/functions/entry.mjs', import.meta.url);
+		const { handler } = await import(entryURL);
+		const resp = await handler({
+			httpMethod: 'POST',
+			headers: {},
+			rawUrl: 'http://example.com/login',
+			body: '{}',
+			isBase64Encoded: false
+		});
+		expect(resp.statusCode).to.equal(301);
+		expect(resp.headers.location).to.equal('/');
+		expect(resp.multiValueHeaders).to.be.deep.equal({
+			'set-cookie': [ 'foo=foo; HttpOnly', 'bar=bar; HttpOnly' ]
+		});
+	});
+});