[Slim4] Add ModelUtils and StringUtils (#4855)

* [Slim4] Add StringUtils and ModelUtils classes

* [Slim4] Refresh samples

samples/server/petstore/php-slim4/test/Utils/ModelUtilsTraitTest.php

@@ -0,0 +1,102 @@
+<?php
+
+/**
+ * ModelUtilsTraitTest
+ *
+ * PHP version 7.1
+ *
+ * @package OpenAPIServer
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+
+/**
+ * OpenAPI Petstore
+ *
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ * 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
+ * Do not edit the class manually.
+ */
+namespace OpenAPIServer\Utils;
+
+use OpenAPIServer\Utils\ModelUtilsTrait as ModelUtils;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * ModelUtilsTraitTest Class Doc Comment
+ *
+ * @package OpenAPIServer\Utils
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ * @coversDefaultClass \OpenAPIServer\Utils\ModelUtilsTrait
+ */
+class ModelUtilsTraitTest extends TestCase
+{
+    /**
+     * @covers ::getSimpleRef
+     * @dataProvider provideRefs
+     */
+    public function testGetSimpleRef($ref, $expectedRef)
+    {
+        $this->assertSame($expectedRef, ModelUtils::getSimpleRef($ref));
+    }
+
+    public function provideRefs()
+    {
+        return [
+            'Reference Object OAS 3.0' => [
+                '#/components/schemas/Pet', 'Pet',
+            ],
+            'Reference Object Swagger 2.0' => [
+                '#/definitions/Pet', 'Pet',
+            ],
+            'Underscored classname' => [
+                '#/components/schemas/_foobar_Objects', '_foobar_Objects',
+            ],
+            'Relative Documents With Embedded Schema' => [
+                'definitions.json#/Pet', null,
+            ],
+            'null as argument' => [
+                null, null,
+            ],
+            'number as argument' => [
+                156, null,
+            ],
+        ];
+    }
+
+    /**
+     * @covers ::toModelName
+     * @dataProvider provideModelNames
+     */
+    public function testToModelName($name, $prefix, $suffix, $expectedModel)
+    {
+        $this->assertSame($expectedModel, ModelUtils::toModelName($name, $prefix, $suffix));
+    }
+
+    public function provideModelNames()
+    {
+        return [
+            // fixtures from modules/openapi-generator/src/test/java/org/openapitools/codegen/utils/StringUtilsTest.java
+            ['abcd', null, null, 'Abcd'],
+            ['some-value', null, null, 'SomeValue'],
+            ['some_value', null, null, 'SomeValue'],
+            ['$type', null, null, 'Type'],
+            ['123', null, null, 'Model123'],
+            ['$123', null, null, 'Model123'],
+            ['return', null, null, 'ModelReturn'],
+            ['200Response', null, null, 'Model200Response'],
+            ['abcd', 'SuperModel', null, 'SuperModelAbcd'],
+            ['abcd', null, 'WithEnd', 'AbcdWithEnd'],
+            ['abcd', 'WithStart', 'AndEnd', 'WithStartAbcdAndEnd'],
+            ['_foobar_Objects', null, null, 'FoobarObjects'],
+            [null, null, null, null],
+        ];
+    }
+}