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#!/usr/bin/env python

# -*- coding: utf-8 -*-

import sys

from io import StringIO

from observer import Subject, Data, DecimalViewer, HexViewer

if sys.version_info < (2, 7):

import unittest2 as unittest

else:

import unittest

from unittest.mock import patch

class TestSubject(unittest.TestCase):

@classmethod

def setUpClass(cls):

cls.s = Subject()

cls.dec_obs = DecimalViewer()

cls.hex_obs = HexViewer()

def test_a_observer_list_shall_be_empty_initially(cls):

cls.assertEqual(len(cls.s._observers), 0)

def test_b_observers_shall_be_attachable(cls):

cls.s.attach(cls.dec_obs)

cls.assertEqual(isinstance(cls.s._observers[0], DecimalViewer), True)

cls.assertEqual(len(cls.s._observers), 1)

cls.s.attach(cls.hex_obs)

cls.assertEqual(isinstance(cls.s._observers[1], HexViewer), True)

cls.assertEqual(len(cls.s._observers), 2)

def test_c_observers_shall_be_detachable(cls):

cls.s.detach(cls.dec_obs)

# hex viewer shall be remaining if dec viewer is detached first

cls.assertEqual(isinstance(cls.s._observers[0], HexViewer), True)

cls.assertEqual(len(cls.s._observers), 1)

cls.s.detach(cls.hex_obs)

cls.assertEqual(len(cls.s._observers), 0)

class TestData(unittest.TestCase):

@classmethod

def setUpClass(cls):

cls.dec_obs = DecimalViewer()

cls.hex_obs = HexViewer()

cls.sub = Data('Data')

#inherited behavior already tested with TestSubject

cls.sub.attach(cls.dec_obs)

cls.sub.attach(cls.hex_obs)

def test_data_change_shall_notify_all_observers_once(cls):

with patch.object(cls.dec_obs, 'update') as mock_dec_obs_update,\

patch.object(cls.hex_obs, 'update') as mock_hex_obs_update:

cls.sub.data = 10

cls.assertEqual(mock_dec_obs_update.call_count, 1)

cls.assertEqual(mock_hex_obs_update.call_count, 1)

def test_data_value_shall_be_changeable(cls):

cls.sub.data = 20

cls.assertEqual(cls.sub._data, 20)

def test_data_name_shall_be_changeable(cls):

cls.sub.name = 'New Data Name'

cls.assertEqual(cls.sub.name, 'New Data Name')

if __name__ == "__main__":

unittest.main()