In the test_short_to_bytes function should add:
print("test_short_to_bytes")
at the beginning and
print(" PASSED")
to the end of the function
Similarly for test_bytes_to_short():
add
print("test_bytes_to_short")
and
print(" PASSED")
to the end.
Finally at the end of the file we should have:
if name == "main":
test_bytes_to_short()
test_short_to_bytes()