1 files changed, 57 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-http-outgoing-renderHeaders.js b/tests/node_compat/test/parallel/test-http-outgoing-renderHeaders.js
new file mode 100644
index 000000000..194a9345a
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-http-outgoing-renderHeaders.js
@@ -0,0 +1,57 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+// Flags: --expose-internals
+
+require('../common');
+const assert = require('assert');
+
+const kOutHeaders = require('internal/http').kOutHeaders;
+const http = require('http');
+const OutgoingMessage = http.OutgoingMessage;
+
+{
+  const outgoingMessage = new OutgoingMessage();
+  outgoingMessage._header = {};
+  assert.throws(
+    () => outgoingMessage._renderHeaders(),
+    {
+      code: 'ERR_HTTP_HEADERS_SENT',
+      name: 'Error',
+      message: 'Cannot render headers after they are sent to the client'
+    }
+  );
+}
+
+{
+  const outgoingMessage = new OutgoingMessage();
+  outgoingMessage[kOutHeaders] = null;
+  const result = outgoingMessage._renderHeaders();
+  assert.deepStrictEqual(result, {});
+}
+
+
+{
+  const outgoingMessage = new OutgoingMessage();
+  outgoingMessage[kOutHeaders] = {};
+  const result = outgoingMessage._renderHeaders();
+  assert.deepStrictEqual(result, {});
+}
+
+{
+  const outgoingMessage = new OutgoingMessage();
+  outgoingMessage[kOutHeaders] = {
+    host: ['host', 'nodejs.org'],
+    origin: ['Origin', 'localhost']
+  };
+  const result = outgoingMessage._renderHeaders();
+  assert.deepStrictEqual(result, {
+    host: 'nodejs.org',
+    Origin: 'localhost'
+  });
+}