Fix: PHP 8.1 compatibility fix for SSE emitter test

Author: logiscapedev

.github/workflows/conformance.yml

@@ -70,4 +70,5 @@ jobs:
           mode: client
           command: 'php conformance/everything-client.php'
           suite: all
-          expected-failures: ./conformance/conformance-baseline.yml
+          timeout: 120000
+          expected-failures: ./conformance/conformance-baseline.yml

CHANGELOG.md

@@ -25,6 +25,7 @@ This file was introduced during the v1.7.x series. Structured entries below cove
   labels, testing) and `conformance/README.md`.
 - GitHub action for official MCP conformance tests
 - GitHub action for unit tests and PHPStan
+- PHP 8.1 compatibility fix for SSE emitter test
 
 ### Removed
 

tests/Server/Transport/Http/Sse/SseEmitterTest.php

@@ -78,7 +78,8 @@ function (string $s) use (&$buffer): void {
     public function testHasEmittedStartsFalse(): void
     {
         $emitter = new SseEmitter(
-            static fn (string $s): null => null,
+            static function (string $s): void {
+            },
             static fn (): bool => false,
         );
         $this->assertFalse($emitter->hasEmitted());