def test_hello(): assert hello('hello') == 'hello, world!\n'
def test_lex_null(): assert hello('') == ''
def test_print_with_escaped_newlines(): assert hello('print butt\\n\n print fart 420 blaze it' ) == ' butt\n fart 420 blaze it'
def test_print_twice(): assert hello( 'print butt\n print fart 420 blaze it') == ' butt fart 420 blaze it'
def test_print(): assert hello('print butt') == ' butt'
def test_hihi(): assert hello('hello hello') == 'hello, world!\nhello, world!\n'
def test_comments(): assert hello('hello no') == 'hello, world!\n'
def test_hello_whitespace(): assert hello('\n\n hello\n\t') == 'hello, world!\n'