1 files changed, 22 insertions, 0 deletions
diff --git a/packages/astro/test/units/cookies/error.test.js b/packages/astro/test/units/cookies/error.test.js
new file mode 100644
index 000000000..027474424
--- /dev/null
+++ b/packages/astro/test/units/cookies/error.test.js
@@ -0,0 +1,22 @@
+import * as assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import { AstroCookies } from '../../../dist/core/cookies/index.js';
+import { apply as applyPolyfill } from '../../../dist/core/polyfill.js';
+
+applyPolyfill();
+
+describe('astro/src/core/cookies', () => {
+	describe('errors', () => {
+		it('Produces an error if the response is already sent', () => {
+			const req = new Request('http://example.com/', {});
+			const cookies = new AstroCookies(req);
+			req[Symbol.for('astro.responseSent')] = true;
+			try {
+				cookies.set('foo', 'bar');
+				assert.equal(false, true);
+			} catch (err) {
+				assert.equal(err.name, 'ResponseSentError');
+			}
+		});
+	});
+});