OrderedDictTest

# -*- coding: utf-8 -*-
"""
Created on Thu Nov  6 16:24:22 2014

@author: wondercsabo
"""

import unittest
from collections import OrderedDict
from functools import reduce

class OrderedDictTest(unittest.TestCase):
    
    def setUp(self):
        self.sut = OrderedDict()
        
    def test_ConstructorShouldCreateEmpty(self):
        self.assertEqual(0, len(self.sut))
        
    def test_getShouldRaiseWhenKeyNotExist(self):
        self.assertRaises(KeyError, lambda: self.sut["key"])
        
    def test_iterateShouldRetainOrder(self):
        self.sut["key1"] = 1
        self.sut["key2"] = 2
        
        self.assertEqual(
            ['key1', 1, 'key2', 2],
            list(reduce(lambda x, y: x + y, self.sut.items())))
        
unittest.main()