added builder pattern

tests/creational_tests/test_builder.py

@@ -0,0 +1,146 @@
+from unittest import TestCase
+from pypatterns.creational.builder import Director, Builder
+from abc import ABCMeta, abstractmethod
+
+
+class BuilderTestCase(TestCase):
+    """
+    Unit testing class for the Builder class.
+    """
+    def setUp(self):
+        """
+        Initialize testing data.
+        """
+        class Building(object):
+            def __init__(self):
+                self.floor = None
+                self.size = None
+
+            def __repr__(self):
+                return 'Floor: {0.floor} | Size: {0.size}'.format(self)
+
+        class HomeBuilder(Builder, metaclass=ABCMeta):
+
+            def __init__(self):
+                super().__init__(Building())
+                self._register('floor', self._build_floor)
+                self._register('size', self._build_size)
+
+            @abstractmethod
+            def _build_floor(self):
+                pass
+
+            @abstractmethod
+            def _build_size(self):
+                pass
+
+        class HouseBuilder(HomeBuilder):
+
+            def _build_floor(self):
+                self.constructed_object.floor = 'One'
+
+            def _build_size(self):
+                self.constructed_object.size = 'Big'
+
+        class FlatBuilder(HomeBuilder):
+
+            def _build_floor(self):
+                self.constructed_object.floor = 'More than one'
+
+            def _build_size(self):
+                self.constructed_object.size = 'Small'
+
+        self.house_builder = HouseBuilder()
+        self.flat_builder = FlatBuilder()
+
+    def test_builder(self):
+        """
+        Test the build method.
+
+        @raise AssertionError: If the test fails.
+        """
+        self.house_builder.build('floor')
+        self.house_builder.build('size')
+        self.assertEquals('One', self.house_builder.constructed_object.floor)
+        self.assertEquals('Big', self.house_builder.constructed_object.size)
+        self.assertEquals('Floor: One | Size: Big', str(self.house_builder.constructed_object))
+
+        self.flat_builder.build('floor')
+        self.flat_builder.build('size')
+        self.assertEquals('More than one', self.flat_builder.constructed_object.floor)
+        self.assertEquals('Small', self.flat_builder.constructed_object.size)
+        self.assertEquals('Floor: More than one | Size: Small', str(self.flat_builder.constructed_object))
+
+
+class DirectorTestCase(TestCase):
+    """
+    Unit testing class for the Director class
+    """
+    def setUp(self):
+        """
+        Initialize testing data.
+        """
+        class Building(object):
+            def __init__(self):
+                self.floor = None
+                self.size = None
+
+            def __repr__(self):
+                return 'Floor: {0.floor} | Size: {0.size}'.format(self)
+
+        class HomeBuilder(Builder, metaclass=ABCMeta):
+            def __init__(self):
+                super().__init__(Building())
+                self._register('floor', self._build_floor)
+                self._register('size', self._build_size)
+
+            @abstractmethod
+            def _build_floor(self):
+                pass
+
+            @abstractmethod
+            def _build_size(self):
+                pass
+
+        class HouseBuilder(HomeBuilder):
+            def _build_floor(self):
+                self.constructed_object.floor = 'One'
+
+            def _build_size(self):
+                self.constructed_object.size = 'Big'
+
+        class FlatBuilder(HomeBuilder):
+            def _build_floor(self):
+                self.constructed_object.floor = 'More than one'
+
+            def _build_size(self):
+                self.constructed_object.size = 'Small'
+
+        class HomeDirector(Director):
+            def construct(self):
+                self.builder.build('floor')
+                self.builder.build('size')
+
+        self.house_builder = HouseBuilder()
+        self.flat_builder = FlatBuilder()
+        self.home_director = HomeDirector()
+
+    def test_construct(self):
+        """
+        Test the construct method.
+
+        @raise AssertionError: If the test fails.
+        """
+        self.home_director.builder = self.house_builder
+        self.home_director.construct()
+        house = self.home_director.get_constructed_object()
+        self.assertEquals('One', house.floor)
+        self.assertEquals('Big', house.size)
+        self.assertEquals('Floor: One | Size: Big', str(house))
+
+        self.home_director.builder = self.flat_builder
+        self.home_director.construct()
+        flat = self.home_director.get_constructed_object()
+        self.assertEquals('More than one', flat.floor)
+        self.assertEquals('Small', flat.size)
+        self.assertEquals('Floor: More than one | Size: Small', str(flat))