[PHP] better PHP symfony test (#14117)

* better php symfony test

* trigger build failure

* Revert "trigger build failure"

This reverts commit ed7a57ead2.

* update samples

samples/server/petstore/php-symfony/SymfonyBundle-php/Tests/Model/EnumStringModelTest.php

@@ -0,0 +1,87 @@
+<?php
+/**
+ * EnumStringModelTest
+ *
+ * PHP version 8.1.1
+ *
+ * @category Class
+ * @package  OpenAPI\Server\Tests\Model
+ * @author   openapi-generator contributors
+ * @link     https://github.com/openapitools/openapi-generator
+ */
+
+/**
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ * Generated by: https://github.com/openapitools/openapi-generator.git
+ *
+ */
+
+/**
+ * NOTE: This class is auto generated by the openapi generator program.
+ * https://github.com/openapitools/openapi-generator
+ * Please update the test case below to test the model.
+ */
+
+namespace OpenAPI\Server\Model;
+
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * EnumStringModelTest Class Doc Comment
+ *
+ * @category    Class
+ * @description enum model
+ * @package     OpenAPI\Server\Tests\Model
+ * @author      openapi-generator contributors
+ * @link        https://github.com/openapitools/openapi-generator
+ * @coversDefaultClass \OpenAPI\Server\Model\EnumStringModel
+ */
+class EnumStringModelTest extends TestCase
+{
+    protected EnumStringModel|MockObject $object;
+
+    /**
+     * Setup before running any test case
+     */
+    public static function setUpBeforeClass(): void
+    {
+    }
+
+    /**
+     * Setup before running each test case
+     */
+    public function setUp(): void
+    {
+         $this->object = $this->getMockBuilder(EnumStringModel::class)->getMockForAbstractClass();
+    }
+
+    /**
+     * Clean up after running each test case
+     */
+    public function tearDown(): void
+    {
+    }
+
+    /**
+     * Clean up after running all test cases
+     */
+    public static function tearDownAfterClass(): void
+    {
+    }
+
+    /**
+     * @group integration
+     * @small
+     */
+    public function testTestClassExists(): void
+    {
+        $this->assertTrue(class_exists(EnumStringModel::class));
+        $this->assertInstanceOf(EnumStringModel::class, $this->object);
+    }
+}