That's beacuse you are getting no results with your query. As the resullt query returns an empty array [].

I was a really fun Kata to play around. Congratulations to the author.
Probably I will try making the same but with the conditions in my Country.

My code work fine in my local machine but when tryingto submit the test always return the same

Expected: 9, instead got: #
 `expect': Expected: 9, instead got: # (Test::Error)
	from `assert_equals'
	from  `
'

I don't know if the is something wrong with the test. Could someone take a look.

I dont understand. You are looking for perfect squares here is a list of perfect squares http://www.mathwarehouse.com/arithmetic/numbers/list-of-perfect-squares.php, in the last test you expect 4 to be in the solution, but in the given array there is no 2 so is not posible to be a 4 in the solution.
This is the test.

Test.assert_equals(get_squares([4,1,16,1,10,35,22]), [1,4,16]).

So it is impossible to be a 4 in the solution