class FileSystemTest

class FileSystemTest extends KernelTestBase {
    
    /**
     * The file handler under test.
     *
     * @var \Drupal\Core\File\FileSystemInterface
     */
    protected $fileSystem;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->fileSystem = $this->container
            ->get('file_system');
    }
    
    /**
     * @covers ::copy
     */
    public function testEnsureFileExistsBeforeCopy() {
        // We need to compute the exception message here because it will include
        // the 'real' path to the file, which varies with $this->siteDirectory.
        $this->expectException(FileNotExistsException::class);
        $this->expectExceptionMessage("File 'public://test.txt' ('{$this->siteDirectory}/files/test.txt') could not be copied because it does not exist");
        $this->fileSystem
            ->copy('public://test.txt', 'public://test-copy.txt');
    }
    
    /**
     * @covers ::copy
     */
    public function testDestinationDirectoryFailureOnCopy() {
        $this->expectException(DirectoryNotReadyException::class);
        $this->expectExceptionMessage("The specified file 'public://test.txt' could not be copied because the destination directory 'public://subdirectory' is not properly configured. This may be caused by a problem with file or directory permissions.");
        touch('public://test.txt');
        // public://subdirectory has not been created, so \Drupal::service('file_system')->prepareDirectory()
        // will fail, causing copy() to throw DirectoryNotReadyException.
        $this->fileSystem
            ->copy('public://test.txt', 'public://subdirectory/test.txt');
    }
    
    /**
     * @covers ::copy
     */
    public function testCopyFailureIfFileAlreadyExists() {
        $this->expectException(FileExistsException::class);
        $this->expectExceptionMessage("File 'public://test.txt' could not be copied because a file by that name already exists in the destination directory ('')");
        $uri = 'public://test.txt';
        touch($uri);
        $this->fileSystem
            ->copy($uri, $uri, FileSystemInterface::EXISTS_ERROR);
    }
    
    /**
     * @covers ::copy
     */
    public function testCopyFailureIfSelfOverwrite() {
        $this->expectException(FileException::class);
        $this->expectExceptionMessage("'public://test.txt' could not be copied because it would overwrite itself");
        $uri = 'public://test.txt';
        touch($uri);
        $this->fileSystem
            ->copy($uri, $uri, FileSystemInterface::EXISTS_REPLACE);
    }
    
    /**
     * @covers ::copy
     */
    public function testCopySelfRename() {
        $uri = 'public://test.txt';
        touch($uri);
        $this->fileSystem
            ->copy($uri, $uri);
        $this->assertFileExists('public://test_0.txt');
    }
    
    /**
     * @covers ::copy
     */
    public function testSuccessfulCopy() {
        touch('public://test.txt');
        $this->fileSystem
            ->copy('public://test.txt', 'public://test-copy.txt');
        $this->assertFileExists('public://test-copy.txt');
    }

}