Write a function to find the lateral surface area of a cylinder.
def lateralsuface_cylinder(r,h):
  lateralsurface= 2*3.1415*r*h
  return lateralsurface
<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 cylinder.
def lateralsuface_cylinder(r,h):
  lateralsurface= 2*3.1415*r*h
  return lateralsurface[/INST]assert lateralsuface_cylinder(10,5)==314.15000000000003
assert lateralsuface_cylinder(4,5)==125.66000000000001
assert lateralsuface_cylinder(4,10)==251.32000000000002</s>