Implemented Proxy design pattern.

pypatterns/structural/proxy.py

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+class Proxy(object):
+    """
+    Base Proxy class as part of the Proxy design pattern.
+    """
+    def __init__(self, subject):
+        """
+        Initialize a new proxy instance.
+
+        @param subject: The real subject this proxy calls upon.
+        """
+        self._subject = subject
+
+
+
+
+
+
+

tests/structural_tests/test_proxy.py

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+from unittest import TestCase
+from pypatterns.structural.proxy import Proxy
+
+
+class ProxyTestCase(TestCase):
+    """
+    Unit testing class for the Proxy class.
+    """
+    def setUp(self):
+        """
+        Initialize testing data.
+        """
+        class Car(object):
+
+            def drive_car(self):
+                return 'drive car'
+
+        class Driver(object):
+
+            def __init__(self, age):
+                self.age = age
+
+        class ProxyCar(Proxy):
+
+            def __init__(self, subject, driver):
+                super().__init__(subject)
+                self.driver = driver
+
+            def drive_car(self):
+                if self.driver.age > 16:
+                    return self._subject.drive_car()
+                else:
+                    return 'Driver is too young to drive'
+
+        self.proxy = ProxyCar(Car(), Driver(17))
+
+    def test_drive_car(self):
+        """
+        Test the proxy with the drive car method.
+
+        @raise AssertionError: If the test fails.
+        """
+        self.assertEqual('drive car', self.proxy.drive_car())
+        self.proxy.driver.age = 15
+        self.assertEqual('Driver is too young to drive', self.proxy.drive_car())