fix: replace deprecated stream_for() with Utils::streamFor()

- Replace deprecated GuzzleHttp\Psr7\stream_for() function with Utils::streamFor()
- Update import statement from function import to class import
- Add tests for getBody() and withBody() methods to ensure proper StreamInterface handling

Fixes deprecation warning in src/Adapter/Psr7/Response.php:11,50

Author: claude

src/Adapter/Psr7/Response.php

@@ -5,11 +5,10 @@
 namespace Deviantintegral\Har\Adapter\Psr7;
 
 use Deviantintegral\Har\Content;
+use GuzzleHttp\Psr7\Utils;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\StreamInterface;
 
-use function GuzzleHttp\Psr7\stream_for;
-
 final class Response extends MessageBase implements ResponseInterface
 {
     /**
@@ -47,7 +46,7 @@ public function getReasonPhrase(): string
 
     public function getBody(): StreamInterface
     {
-        return stream_for($this->response->getContent()->getText());
+        return Utils::streamFor($this->response->getContent()->getText());
     }
 
     public function withBody(StreamInterface $body): \Psr\Http\Message\MessageInterface

tests/src/Unit/Adapter/Psr7/ResponseTest.php

@@ -128,4 +128,28 @@ public function testWithAddedHeaderArrayValue()
         $withAdded = $this->response->withAddedHeader('X-Custom', ['value1', 'value2']);
         $this->assertEquals(['value1', 'value2'], $withAdded->getHeader('X-Custom'));
     }
+
+    public function testGetBody()
+    {
+        $body = $this->response->getBody();
+        $this->assertInstanceOf(\Psr\Http\Message\StreamInterface::class, $body);
+
+        // Verify the body content matches the response content
+        $bodyContent = $body->getContents();
+        $this->assertIsString($bodyContent);
+        $this->assertNotEmpty($bodyContent);
+    }
+
+    public function testWithBody()
+    {
+        $newBodyContent = 'Test body content';
+        $newBody = \GuzzleHttp\Psr7\Utils::streamFor($newBodyContent);
+
+        $withBody = $this->response->withBody($newBody);
+        $this->assertInstanceOf(Response::class, $withBody);
+
+        // Verify the new body content
+        $resultBody = $withBody->getBody();
+        $this->assertEquals($newBodyContent, $resultBody->getContents());
+    }
 }