Thank you, guys, I will check thngs out ...expecially - arguments[1]
...indeed! the case was with it...I have subsided it with plain figure - 23 and
get it passed...
Thank you all!

I know, but he's actually using it in his code. That's why it fails, and there is also another problem:

Finish the solution so that it returns the sum of all the multiples of 3 or 5 BELOW the number passed in.

Maybe this confuses him:

function test(n, expected) {
  let actual = solution(n) // your function, only one argument
  Test.assertEquals(actual, expected, `Expected ${expected}, got ${actual}`)
}

Test.describe("basic tests", function(){
  test(10,23) // 10 here is the number passed to your function, and 23 is the expected value, it depends on the number passed to your function.
})

Ranks can't be changed.

@Chrono79 JS doesn't care. :)

@plav2019 solveProblem doesn't exist.

Also, you're overcomplicating things. It's not really that complex. :]

Why are you using a second argument in your function? Your function is always called with a single argument in the tests.

Without seeing your code we can only guess. If you post your code, use markdown formatting and mark your post as having spoiler content.

return resNum.pop();
...maybe put here the code - so someone could check?
...with spoiler tag?...

...no - the return ...;
is present -

You're probably printing the result instead of returning it.

JavaScript...
Hi guys!
Icannot pass test for the KATA - see below...
I have tested on in GOOGLE Dev.tools
and the result is that of expected, - but
I cannot pass it here...
I end up with single number - say 23 for (10,23) and 14 for (8,23)
but test states - 'undefined'
what can it be?

thenks in advance

Description:
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in.
Note: If the number is a multiple of both 3 and 5, only count it once.