Write a function to find the surface area of a cylinder.
def surfacearea_cylinder(r,h):
  surfacearea=((2*3.1415*r*r) +(2*3.1415*r*h))
  return surfacearea
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to find the surface area of a cylinder.
def surfacearea_cylinder(r,h):
  surfacearea=((2*3.1415*r*r) +(2*3.1415*r*h))
  return surfacearea[/INST]assert surfacearea_cylinder(10,5)==942.45
assert surfacearea_cylinder(4,5)==226.18800000000002
assert surfacearea_cylinder(4,10)==351.848</s>