Write a python function to find the next perfect square greater than a given number.
import math  
def next_Perfect_Square(N): 
    nextN = math.floor(math.sqrt(N)) + 1
    return nextN * nextN 
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a python function to find the next perfect square greater than a given number.
import math  
def next_Perfect_Square(N): 
    nextN = math.floor(math.sqrt(N)) + 1
    return nextN * nextN [/INST]assert next_Perfect_Square(35) == 36
assert next_Perfect_Square(6) == 9
assert next_Perfect_Square(9) == 16</s>