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    $path = file_create_filename($basename, $directory);

    $this->assertEqual($path, $expected, format_string('Creating a new filepath from %original equals %new.', array('%new' => $path, '%original' => $original)), 'File');

    // @TODO: Finally we copy a file into a directory several times, to ensure a properly iterating filename suffix.

  }

    $this->assertNotEqual($path, $destination, 'A new filepath destination is created when filepath destination already exists with FILE_EXISTS_RENAME.', 'File');

    $path = file_destination($destination, FILE_EXISTS_ERROR);

    $this->assertEqual($path, FALSE, 'An error is returned when filepath destination already exists with FILE_EXISTS_ERROR.', 'File');

  }

  /**