FileModuleTest.php

<?php

namespace Drupal\Tests\file\Kernel;

use Drupal\Component\Utility\Environment;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\KernelTests\KernelTestBase;
use Symfony\Component\HttpFoundation\File\UploadedFile;

/**
 * Tests file.module methods.
 *
 * @group file
 */
class FileModuleTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    public static $modules = [
        'file',
    ];
    
    /**
     * Tests file size upload errors.
     *
     * @throws \Drupal\Core\Entity\EntityStorageException
     */
    public function testFileSaveUploadSingleErrorFormSize() {
        $file_name = $this->randomMachineName();
        $file_info = $this->createMock(UploadedFile::class);
        $file_info->expects($this->once())
            ->method('getError')
            ->willReturn(UPLOAD_ERR_FORM_SIZE);
        $file_info->expects($this->once())
            ->method('getClientOriginalName')
            ->willReturn($file_name);
        $this->assertFalse(\_file_save_upload_single($file_info, 'name'));
        $expected_message = new TranslatableMarkup('The file %file could not be saved because it exceeds %maxsize, the maximum allowed size for uploads.', [
            '%file' => $file_name,
            '%maxsize' => format_size(Environment::getUploadMaxSize()),
        ]);
        $this->assertEquals($expected_message, \Drupal::messenger()->all()['error'][0]);
    }

}