input: Write a python function to create a Point class that initializes with x and y coordinates and test it.
  assert point.x == 2
  assert point.y == 3
output: class Point:
      def __init__(self, x, y):
          self.x = x
          self.y = y
  
  point = Point(2, 3)
  assert point.x == 2
  assert point.y == 3