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#!/usr/bin/env python

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

import os

import shutil

import unittest

from patterns.behavioral.command import MoveFileCommand

class CommandTest(unittest.TestCase):

@classmethod

def __get_test_directory(self):

"""

Get the temporary directory for the tests.

"""

self.test_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'test_command')

@classmethod

def setUpClass(self):

"""

- Create a temporary directory and file

/test_command

/foo.txt

- get the temporary test directory

- and initializes the command stack.

"""

os.mkdir('tests/behavioral/test_command')

open('tests/behavioral/test_command/foo.txt', 'w').close()

self.__get_test_directory()

self.command_stack = []

self.command_stack.append(

MoveFileCommand(os.path.join(self.test_dir, 'foo.txt'), os.path.join(self.test_dir, 'bar.txt'))

)

self.command_stack.append(

MoveFileCommand(os.path.join(self.test_dir, 'bar.txt'), os.path.join(self.test_dir, 'baz.txt'))

)

def test_sequential_execution(self):

self.command_stack[0].execute()

output_after_first_execution = os.listdir(self.test_dir)

self.assertEqual(output_after_first_execution[0], 'bar.txt')

self.command_stack[1].execute()

output_after_second_execution = os.listdir(self.test_dir)

self.assertEqual(output_after_second_execution[0], 'baz.txt')

def test_sequential_undo(self):

self.command_stack = list(reversed(self.command_stack))

self.command_stack[0].undo()

output_after_first_undo = os.listdir(self.test_dir)

self.assertEqual(output_after_first_undo[0], 'bar.txt')

self.command_stack[1].undo()

output_after_second_undo = os.listdir(self.test_dir)

self.assertEqual(output_after_second_undo[0], 'foo.txt')

@classmethod

def tearDownClass(self):

"""

Remove the temporary directory /test_command and its content.

"""

shutil.rmtree('tests/behavioral/test_command')