Write a function to find the lateral surface area of a cube.
def lateralsurface_cube(l):
  LSA = 4 * (l * l)
  return LSA
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to find the lateral surface area of a cube.
def lateralsurface_cube(l):
  LSA = 4 * (l * l)
  return LSA[/INST]assert lateralsurface_cube(5)==100
assert lateralsurface_cube(9)==324
assert lateralsurface_cube(10)==400</s>