fix(state): error xml format output (#7273)

Author: soyuka

src/State/ApiResource/Error.php

@@ -36,7 +36,10 @@
             errors: [],
             name: '_api_errors_problem',
             routeName: '_api_errors',
-            outputFormats: ['json' => ['application/problem+json', 'application/json']],
+            outputFormats: [
+                'json' => ['application/problem+json', 'application/json'],
+                'xml' => ['application/xml', 'text/xml'],
+            ],
             hideHydraOperation: true,
             normalizationContext: [
                 SchemaFactory::OPENAPI_DEFINITION_NAME => '',

tests/Functional/ErrorTest.php

@@ -91,4 +91,21 @@ public function testJsonError(): void
         $this->assertResponseStatusCodeSame(415);
         $this->assertJsonContains(['detail' => 'The content-type "application/json" is not supported. Supported MIME types are "application/xml".']);
     }
+
+    public function testXmlError(): void
+    {
+        self::createClient()->request('GET', '/notfound', [
+            'headers' => ['accept' => 'text/xml'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(404);
+        $this->assertResponseHeaderSame('content-type', 'application/xml; charset=utf-8');
+
+        self::createClient()->request('GET', '/notfound', [
+            'headers' => ['accept' => 'application/xml'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(404);
+        $this->assertResponseHeaderSame('content-type', 'application/xml; charset=utf-8');
+    }
 }