Bugged user.

And who says they are? Can you explain what the problem is exactly?

Your solution causes following error:

Incorrect answer for number=-21
Expected: equal to "Odd"
Actual: "Even"

Your solution incorrectly returns "Even" for n=-21.

Bugged kata, -21 and -977 are not even.

Found it in the below comments

how to do the test any coding. whatever i type it shows error