Prg2/unit testing

This is part of Programming 2 2563

Clips

• Unit testing and mock objects: youtube

Codes

Using mocks to hide tkinter

File: test_maze.py

import unittest
from unittest.mock import MagicMock, patch

from dir_consts import *
from maze import Maze

class MazeTest(unittest.TestCase):

    @patch('tkinter.PhotoImage')
    def setUp(self, MockPhotoImage):
        self.app = MagicMock()

        self.maze = Maze(self.app, 800, 600)
        self.MockPhotoImage = MockPhotoImage

    def test_run(self):
        self.assertFalse(self.maze.is_movable_direction(1, 1, DIR_UP))
        self.assertTrue(self.maze.is_movable_direction(1, 1, DIR_DOWN))
        self.assertFalse(self.maze.is_movable_direction(1, 1, DIR_LEFT))
        self.assertTrue(self.maze.is_movable_direction(1, 1, DIR_RIGHT))

    def test_eat_dot(self):
        self.assertTrue(self.maze.has_dot_at(1, 1))
        self.maze.eat_dot_at(1, 1)
        self.assertFalse(self.maze.has_dot_at(1, 1))

Interaction testing with mocks

File: test_pacman.py

import unittest

from unittest.mock import MagicMock, patch

from dir_consts import *
from main import Pacman

class PacmanTest(unittest.TestCase):

    @patch('tkinter.PhotoImage')
    def setUp(self, MockPhotoImage):
        self.app = MagicMock()
        self.maze = MagicMock()

        self.maze.piece_center.return_value = (20, 60)
        self.pacman = Pacman(self.app, self.maze, 1, 1)

    def test_eat_available_dot(self):
        maze = self.maze

        maze.is_at_center.return_value = True
        maze.xy_to_rc.return_value = (1,1)
        maze.has_dot_at.return_value = True

        self.pacman.update()

        self.assertTrue(maze.eat_dot_at.called)

    def test_eat_no_dot(self):
        maze = self.maze

        maze.is_at_center.return_value = True
        maze.xy_to_rc.return_value = (1,1)
        maze.has_dot_at.return_value = False

        self.pacman.update()

        self.assertFalse(maze.eat_dot_at.called)