From ac6bf5c62cdbb1f54c9ed3e40f6f67ff5746453e Mon Sep 17 00:00:00 2001
From: Khafra <42794878+KhafraDev@users.noreply.github.com>
Date: Mon, 28 Nov 2022 23:26:04 -0500
Subject: [PATCH] wpt: update `response-static-error.any.js`

---
 .../fetch/api/response/response-static-error.any.js  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/wpt/tests/fetch/api/response/response-static-error.any.js b/test/wpt/tests/fetch/api/response/response-static-error.any.js
index 4097eab37b4..1f8c49ab006 100644
--- a/test/wpt/tests/fetch/api/response/response-static-error.any.js
+++ b/test/wpt/tests/fetch/api/response/response-static-error.any.js
@@ -11,6 +11,18 @@ test(function() {
   assert_true(responseError.headers.entries().next().done, "Headers should be empty");
 }, "Check response returned by static method error()");
 
+promise_test (async function() {
+  let response = await fetch("../resources/data.json");
+
+  try {
+    response.headers.append('name', 'value');
+  } catch (e) {
+    assert_equals(e.constructor.name, "TypeError");
+  }
+
+  assert_not_equals(response.headers.get("name"), "value", "response headers should be immutable");
+}, "Ensure response headers are immutable");
+
 test(function() {
   const headers = Response.error().headers;