bug #1168 Address PHP and PHPUnit deprecations (chr-hertel)

This PR was merged into the main branch.

Discussion
----------

 Address PHP and PHPUnit deprecations

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Docs?         | no
| Issues        |
| License       | MIT

Addressing deprecations/notices raised while executing PHPUnit - mostly PHPUnit and PHP deprecations

Commits
-------

8c1c402 Address PHP and PHPUnit deprecations

Author: chr-hertel

demo/tests/Blog/Command/StreamCommandTest.php

@@ -26,7 +26,7 @@ class StreamCommandTest extends TestCase
 {
     public function testStreamCommandOutputsStreamedContentAndSuccess()
     {
-        $mockAgent = $this->createMock(AgentInterface::class);
+        $mockAgent = $this->createStub(AgentInterface::class);
         $mockAgent
             ->method('call')
             ->with($this->isInstanceOf(MessageBag::class), ['stream' => true])

src/agent/composer.json

@@ -31,6 +31,7 @@
         "symfony/ai-platform": "@dev",
         "symfony/clock": "^7.3|^8.0",
         "symfony/http-client": "^7.3|^8.0",
+        "symfony/polyfill-php85": "^1.33",
         "symfony/property-access": "^7.3|^8.0",
         "symfony/property-info": "^7.3|^8.0",
         "symfony/serializer": "^7.3|^8.0",

src/agent/src/Memory/EmbeddingProvider.php

@@ -36,7 +36,7 @@ public function load(Input $input): array
     {
         $messages = $input->getMessageBag()->getMessages();
         /** @var MessageInterface|null $userMessage */
-        $userMessage = $messages[array_key_last($messages)] ?? null;
+        $userMessage = array_last($messages) ?? null;
 
         if (!$userMessage instanceof UserMessage) {
             return [];

src/ai-bundle/tests/Command/AgentCallCommandTest.php

@@ -53,11 +53,6 @@ public function testCommandFailsWithInvalidAgent()
         }
     }
 
-    public function testCommandPromptsForAgentSelectionWhenNoneProvided()
-    {
-        $this->markTestSkipped('CommandTester does not properly support interact() method with question helper');
-    }
-
     public function testCommandExecutesWithValidAgent()
     {
         $agent = $this->createMock(AgentInterface::class);

src/mcp-bundle/tests/DependencyInjection/McpPassTest.php

@@ -18,9 +18,6 @@
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
 
-/**
- * @covers \Symfony\AI\McpBundle\DependencyInjection\McpPass
- */
 final class McpPassTest extends TestCase
 {
     public function testCreatesServiceLocatorForAllMcpServices()

src/platform/src/Bridge/HuggingFace/ResultConverter.php

@@ -57,7 +57,8 @@ public function convert(RawResultInterface|RawHttpResult $result, array $options
 
         $headers = $httpResponse->getHeaders(false);
         $contentType = $headers['content-type'][0] ?? null;
-        $content = str_contains($contentType, 'application/json') ? $httpResponse->toArray(false) : $httpResponse->getContent(false);
+        $content = null !== $contentType && str_contains($contentType, 'application/json')
+            ? $httpResponse->toArray(false) : $httpResponse->getContent(false);
 
         if (str_starts_with((string) $httpResponse->getStatusCode(), '4')) {
             $message = match (true) {