Ahhh, got it. I missed that, thank you!

That's not a kata issue, your code is returning a wrong answer. If there is no anchor, then your code should return exactly the same url, as shown in the example and expected in the test.

expected 'www.codewars.com/katas' // <- This is your answer, you removed the / at the end
to equal 'www.codewars.com/katas/'

In the directions the second example given does not have an anchor (#) in it: "www.codewars.com?page=1" -->"www.codewars.com?page=1"

The third test case gives an error message because it does not have an anchor (#) in it: expected 'www.codewars.com/katas' to equal 'www.codewars.com/katas/'