Integration test for checking file generation and removing process

dev/tests/integration/testsuite/Magento/Framework/App/Filesystem/CreatePdfFileTest.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ *
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\App\Filesystem\Images;
+
+use Magento\Framework\App\Filesystem\DirectoryList;
+use Magento\Framework\App\Response\Http\FileFactory;
+use Magento\Framework\Filesystem;
+use Magento\TestFramework\Helper\Bootstrap;
+use Zend\Http\Header\ContentType;
+
+/**
+ * Class CreatePdfFileTest
+ *
+ * Integration test for testing a file creation from string
+ */
+class CreatePdfFileTest extends \PHPUnit\Framework\TestCase
+{
+    public function testGenerateFileFromString()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        /** @var FileFactory $fileFactory */
+        $fileFactory =  $objectManager->get(FileFactory::class);
+        /** @var Filesystem $filesystem */
+        $filesystem = $objectManager->get(Filesystem::class);
+        $filename = 'test.pdf';
+        $contentType = 'application/pdf';
+        $fileContent = ['type' => 'string', 'value' => ''];
+        $response = $fileFactory->create($filename, $fileContent, DirectoryList::VAR_DIR, $contentType);
+        /** @var ContentType $contentTypeHeader */
+        $contentTypeHeader = $response->getHeader('Content-type');
+
+        /* Check the system returns the correct type */
+        self::assertEquals("Content-Type: $contentType", $contentTypeHeader->toString());
+
+        $varDirectory = $filesystem->getDirectoryRead(DirectoryList::VAR_DIR);
+        $varDirectory->isFile($filename);
+
+        /* Check the file is generated */
+        self::assertTrue($varDirectory->isFile($filename));
+
+        /* Check the file is removed after generation if the corresponding option is set */
+        $fileContent = ['type' => 'string', 'value' => '', 'rm' => true];
+        $fileFactory->create($filename, $fileContent, DirectoryList::VAR_DIR, $contentType);
+
+        self::assertFalse($varDirectory->isFile($filename));
+    }
+}