class FileTest

FileTest.directory?(String file) -> bool

FileTest.exist?(String file) -> bool

FileTest.file?(String file) -> bool

FileTest.pipe?(String file) -> bool

FileTest.size(String |nil file) -> Integer

FileTest.size?(String file) -> (Integer | nil)

FileTest.socket?(String file) -> bool

FileTest.symlink?(String file) -> bool

FileTest.zero?(String file) -> bool