Write a function to caluclate area of a parallelogram.
def parallelogram_area(b,h):
  area=b*h
  return area
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to caluclate area of a parallelogram.
def parallelogram_area(b,h):
  area=b*h
  return area[/INST]assert parallelogram_area(10,20)==200
assert parallelogram_area(15,20)==300
assert parallelogram_area(8,9)==72</s>