from __future__ import absolute_import, division, print_function


def echo(text_one, text_two):
    print('text_one: ' + text_one)
    print('text_two: ' + text_two)


def echo_helloworld():
    print('Hello world')

from __future__ import absolute_import, division, print_function


def echo(text_one, text_two):
    print('text_one: ' + text_one)
    print('text_two: ' + text_two)


def echo_helloworld():
    print('Hello world')


def error(**kwargs):
    assert False, "Some error occurred: " + str(kwargs)

Add 'error' example case to demo for simple tests