url: add Symbol.toStringTag to URLPattern

Define Symbol.toStringTag on URLPattern.prototype so its class string
matches the Web IDL interface name.

Add coverage for the property descriptor and
Object.prototype.toString().

Fixes: #65924
Signed-off-by: XadillaX <i@2333.moe>

Author: XadillaX

src/node_url_pattern.cc

@@ -687,6 +687,10 @@ static void Initialize(Local<Object> target,
   auto instance_template = ctor_tmpl->InstanceTemplate();
   auto prototype_template = ctor_tmpl->PrototypeTemplate();
   ctor_tmpl->SetClassName(FIXED_ONE_BYTE_STRING(isolate, "URLPattern"));
+  prototype_template->Set(
+      v8::Symbol::GetToStringTag(isolate),
+      FIXED_ONE_BYTE_STRING(isolate, "URLPattern"),
+      static_cast<PropertyAttribute>(ReadOnly | v8::DontEnum));
 
   // The signature is used to prevent the property accessors from being
   // called on the wrong receiver object (`this`)

test/parallel/test-urlpattern.js

@@ -5,6 +5,20 @@ require('../common');
 const assert = require('assert');
 const { URLPattern } = require('url');
 
+{
+  assert.deepStrictEqual(
+    Object.getOwnPropertyDescriptor(URLPattern.prototype, Symbol.toStringTag),
+    {
+      configurable: true,
+      enumerable: false,
+      value: 'URLPattern',
+      writable: false,
+    });
+  assert.strictEqual(
+    Object.prototype.toString.call(new URLPattern()),
+    '[object URLPattern]');
+}
+
 // Verify that if an error is thrown while accessing any of the
 // init options, the error is appropriately propagated.
 assert.throws(() => {