\set ECHO none
-- You should write your tests
SELECT ratio('foo', 'bar');
 ratio 
-------
     0
(1 row)

SELECT ratio('foo', 'foo');
 ratio 
-------
   100
(1 row)

SELECT ratio('你好', '你好世界');
 ratio 
-------
    67
(1 row)

SELECT ratio('hello', 'hello world');
 ratio 
-------
    63
(1 row)

SELECT ratio('', '');
 ratio 
-------
     0
(1 row)

SELECT ratio(null, 'hello');
 ratio 
-------
     0
(1 row)

SELECT ratio(null, null);
 ratio 
-------
     0
(1 row)

ROLLBACK;