It is the duty of the Kata author(s) to enforce any rules in the test cases

you should obey the rules！！

Its a Copy of This Kata

https://www.codewars.com/kata/5a431c0de1ce0ec33a00000c

fixed, Thank you

First sample test is wrong, 3 is odd.

Not really because this is addition, not multiplication.

create a function that will recieve two numbers and return their sum

And then you call the function with only one or no argument. Not a good idea leaving that unexplained for a simple kata, that's confusing for beginners.

Duplicate of "Multiply" kata.

Didn't realize I had to spoiler replies to solutions — thank you, will do next time!

Use spoiler flag next time, please.

The kata says not to do this :l