Merge branch 'dev' of https://github.com/0--key/python-patterns into dev

Author: 0--key

tests/test_lazy.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+import unittest
+from creational.lazy_evaluation import Person
+
+
+class TestDynamicExpanding(unittest.TestCase):
+
+    def setUp(self):
+        self.John = Person('John', 'Coder')
+
+    def test_innate_properties(self):
+        self.assertDictEqual({'name': 'John', 'occupation': 'Coder'},
+                             self.John.__dict__)
+
+    def test_relatives_not_in_properties(self):
+        self.assertNotIn('relatives', self.John.__dict__)
+
+    def test_extended_properties(self):
+        print("Jhon's relatives: {0}".format(self.John.relatives))
+        self.assertDictEqual({'name': 'John', 'occupation': 'Coder',
+                              'relatives': 'Many relatives.'},
+                             self.John.__dict__)
+
+    def test_relatives_after_access(self):
+        print("Jhon's relatives: {0}".format(self.John.relatives))
+        self.assertIn('relatives', self.John.__dict__)