OXDEV-8213 Improve CoreThemeFactory along test coverage

src/Theme/Infrastructure/CoreThemeFactory.php

@@ -17,6 +17,11 @@ class CoreThemeFactory implements CoreThemeFactoryInterface
      * @inheritDoc
      */
     public function create(): Theme
+    {
+        return $this->createTheme();
+    }
+
+    protected function createTheme(): Theme
     {
         return oxNew(Theme::class);
     }

tests/Unit/Theme/Infrastructure/CoreThemeFactoryTest.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Copyright © OXID eSales AG. All rights reserved.
+ * See LICENSE file for license details.
+ */
+
+declare(strict_types=1);
+
+namespace OxidEsales\GraphQL\ConfigurationAccess\Tests\Unit\Theme\Infrastructure;
+
+use OxidEsales\GraphQL\ConfigurationAccess\Theme\Infrastructure\CoreThemeFactory;
+use PHPUnit\Framework\TestCase;
+use OxidEsales\Eshop\Core\Theme;
+
+/**
+ * @covers \OxidEsales\GraphQL\ConfigurationAccess\Theme\Infrastructure\CoreThemeFactory
+ */
+class CoreThemeFactoryTest extends TestCase
+{
+    public function testCreateProducesCorrectTypeOfObjects(): void
+    {
+        $sut = $this->getSut();
+        $this->assertInstanceOf(Theme::class, $sut->create());
+    }
+
+    public function testCreateProducesDifferentObjectsOnEveryCall(): void
+    {
+        $model1 = $this->getSut()->create();
+        $model2 = $this->getSut()->create();
+
+        $this->assertNotSame($model1, $model2);
+    }
+
+    private function getSut(): CoreThemeFactory
+    {
+        $coreThemeFactoryMock = $this->getMockBuilder(CoreThemeFactory::class)
+            ->onlyMethods(['createTheme'])
+            ->getMock();
+
+        $coreThemeFactoryMock->method('createTheme')
+            ->willReturn(new Theme());
+
+        return $coreThemeFactoryMock;
+    }
+}