changed dummy class to a dummy class factory

tests/creational_tests/test_singleton.py

@@ -1,5 +1,7 @@
 from unittest import TestCase
-from creational import singleton
+
+from tests.utils.dummy_class import dummy_factory
+from patterns.creational import Singleton
 
 
 class SingletonTestCase(TestCase):
@@ -9,6 +11,16 @@ class SingletonTestCase(TestCase):
     def setUp(self):
         """
         Initialize testing data.
-
-        :return:
         """
+        self.dummy_class = dummy_factory(base_class=Singleton, attributes={}, functions={})
+
+    def test_id(self):
+        """
+        Test the id's of two singleton instances.
+
+        @raise AssertionError: If the test fails.
+        """
+        dummy = self.dummy_class()
+        dummy_2 = self.dummy_class()
+
+        self.assertEquals(id(dummy), id(dummy_2))