minor #451 [Platform][HuggingFace] Refactor test using MockClient properly (OskarStark)

This PR was merged into the main branch.

Discussion
----------

[Platform][HuggingFace] Refactor test using `MockClient` properly

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

Commits
-------

3aaa588 refactor: use MockHttpClient callback for URL assertions

Author: OskarStark

src/platform/tests/Bridge/HuggingFace/ModelClientTest.php

@@ -26,6 +26,7 @@
 use Symfony\AI\Platform\Message\UserMessage;
 use Symfony\AI\Platform\Model;
 use Symfony\Component\HttpClient\MockHttpClient;
+use Symfony\Component\HttpClient\Response\MockResponse;
 
 #[CoversClass(ModelClient::class)]
 #[Small]
@@ -35,16 +36,23 @@ final class ModelClientTest extends TestCase
     #[DataProvider('urlTestCases')]
     public function testGetUrlForDifferentInputsAndTasks(?string $task, string $expectedUrl)
     {
-        $reflection = new \ReflectionClass(ModelClient::class);
-        $getUrlMethod = $reflection->getMethod('getUrl');
+        $response = new MockResponse('{"result": "test"}', [
+            'http_code' => 200,
+        ]);
+
+        $httpClient = new MockHttpClient(function (string $method, string $url) use ($expectedUrl, $response): MockResponse {
+            $this->assertSame('POST', $method);
+            $this->assertSame($expectedUrl, $url);
+
+            return $response;
+        });
 
         $model = new Model('test-model');
-        $httpClient = new MockHttpClient();
         $modelClient = new ModelClient($httpClient, 'test-provider', 'test-api-key');
 
-        $actualUrl = $getUrlMethod->invoke($modelClient, $model, $task);
-
-        $this->assertEquals($expectedUrl, $actualUrl);
+        // Make a request to trigger URL generation
+        $options = $task ? ['task' => $task] : [];
+        $modelClient->request($model, 'test input', $options);
     }
 
     public static function urlTestCases(): \Iterator
@@ -76,37 +84,56 @@ public static function urlTestCases(): \Iterator
     #[DataProvider('payloadTestCases')]
     public function testGetPayloadForDifferentInputsAndTasks(object|array|string $input, array $options, array $expectedKeys, array $expectedValues = [])
     {
+        $response = new MockResponse('{"result": "test"}');
+        $httpClient = new MockHttpClient($response);
+
+        $model = new Model('test-model');
+        $modelClient = new ModelClient($httpClient, 'test-provider', 'test-api-key');
+
         // Contract handling first
         $contract = Contract::create(
             new FileNormalizer(),
             new MessageBagNormalizer()
         );
 
-        $payload = $contract->createRequestPayload(new Model('test-model'), $input);
-
-        $reflection = new \ReflectionClass(ModelClient::class);
-        $getPayloadMethod = $reflection->getMethod('getPayload');
+        $payload = $contract->createRequestPayload($model, $input);
 
-        $httpClient = new MockHttpClient();
-        $modelClient = new ModelClient($httpClient, 'test-provider', 'test-api-key');
+        // Make a request to trigger payload generation
+        $modelClient->request($model, $payload, $options);
 
-        $actual = $getPayloadMethod->invoke($modelClient, $payload, $options);
+        // Get the request options that were sent
+        $requestOptions = $response->getRequestOptions();
 
-        // Check that expected keys exist
+        // Check that expected keys exist in the transformed structure
         foreach ($expectedKeys as $key) {
-            $this->assertArrayHasKey($key, $actual);
+            if ('json' === $key) {
+                // JSON gets transformed to body in HTTP client
+                $this->assertArrayHasKey('body', $requestOptions);
+            } elseif ('headers' === $key) {
+                $this->assertArrayHasKey('headers', $requestOptions);
+            }
         }
 
         // Check expected values if specified
         foreach ($expectedValues as $path => $value) {
             $keys = explode('.', $path);
-            $current = $actual;
-            foreach ($keys as $key) {
-                $this->assertArrayHasKey($key, $current);
-                $current = $current[$key];
-            }
 
-            $this->assertEquals($value, $current);
+            if ('headers' === $keys[0] && 'Content-Type' === $keys[1]) {
+                // Check Content-Type header in the normalized structure
+                $this->assertContains('Content-Type: application/json', $requestOptions['headers']);
+            } elseif ('json' === $keys[0]) {
+                // JSON content is in the body, need to decode
+                $body = json_decode($requestOptions['body'], true);
+                $current = $body;
+
+                // Navigate through the remaining keys
+                for ($i = 1; $i < \count($keys); ++$i) {
+                    $this->assertArrayHasKey($keys[$i], $current);
+                    $current = $current[$keys[$i]];
+                }
+
+                $this->assertEquals($value, $current);
+            }
         }
     }