def test_start_overflow():
 t = usertypes.Timer()
 with pytest.raises(OverflowError):
  t.start((2 ** 64))

def test_start_overflow ( ) : t = usertypes . Timer ( ) with pytest . raises ( OverflowError ) : t . start ( ( 2 ** 64 ) )
make sure start raises overflowerror with very big numbers .