Possible tests examples:
def test_find_perimeter_1():
""" Tests if the function can handle two positive integer values as input.
"""
res = find_perimeter(4, 5)
assert res == 18
def test_find_rectangle_perimeter_zero_width():
""" Tests if the function can handle width set to 0.
"""
res = find_perimeter(0, 3)
assert res == 0