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diff --git a/tests/test_using.py b/tests/test_using.py
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+++ b/tests/test_using.py
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+# -*- coding: utf-8 -*-
+# Copyright (c) 2011 Raphaël Barrois
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+"""Tests using factory."""
+
+import unittest
+
+import factory
+
+
+
+class TestObject(object):
+    def __init__(self, one=None, two=None, three=None, four=None):
+        self.one = one
+        self.two = two
+        self.three = three
+        self.four = four
+
+class FakeDjangoModel(object):
+    class FakeDjangoManager(object):
+        def create(self, **kwargs):
+            fake_model = FakeDjangoModel(**kwargs)
+            fake_model.id = 1
+            return fake_model
+
+    objects = FakeDjangoManager()
+
+    def __init__(self, **kwargs):
+        for name, value in kwargs.iteritems():
+            setattr(self, name, value)
+            self.id = None
+
+class TestModel(FakeDjangoModel):
+    pass
+
+
+class SimpleBuildTestCase(unittest.TestCase):
+    """Tests the minimalist 'factory.build/create' functions."""
+
+    def test_build(self):
+        obj = factory.build(TestObject, two=2)
+        self.assertEqual(obj.one, None)
+        self.assertEqual(obj.two, 2)
+        self.assertEqual(obj.three, None)
+        self.assertEqual(obj.four, None)
+
+    def test_complex(self):
+        obj = factory.build(TestObject, two=2, three=factory.LazyAttribute(lambda o: o.two + 1))
+        self.assertEqual(obj.one, None)
+        self.assertEqual(obj.two, 2)
+        self.assertEqual(obj.three, 3)
+        self.assertEqual(obj.four, None)
+
+    def test_create(self):
+        obj = factory.create(FakeDjangoModel, foo='bar')
+        self.assertEqual(obj.id, 1)
+        self.assertEqual(obj.foo, 'bar')
+
+    def test_stub(self):
+        obj = factory.stub(TestObject, three=3)
+        self.assertEqual(obj.three, 3)
+        self.assertFalse(hasattr(obj, 'two'))
+
+    def test_make_factory(self):
+        fact = factory.make_factory(TestObject, two=2, three=factory.LazyAttribute(lambda o: o.two + 1))
+
+        obj = fact.build()
+        self.assertEqual(obj.one, None)
+        self.assertEqual(obj.two, 2)
+        self.assertEqual(obj.three, 3)
+        self.assertEqual(obj.four, None)
+
+        obj = fact.build(two=4)
+        self.assertEqual(obj.one, None)
+        self.assertEqual(obj.two, 4)
+        self.assertEqual(obj.three, 5)
+        self.assertEqual(obj.four, None)
+
+
+class FactoryTestCase(unittest.TestCase):
+    def testAttribute(self):
+        class TestObjectFactory(factory.Factory):
+            one = 'one'
+
+        test_object = TestObjectFactory.build()
+        self.assertEqual(test_object.one, 'one')
+
+    def testSequence(self):
+        class TestObjectFactory(factory.Factory):
+            one = factory.Sequence(lambda n: 'one' + n)
+            two = factory.Sequence(lambda n: 'two' + n)
+
+        test_object0 = TestObjectFactory.build()
+        self.assertEqual(test_object0.one, 'one0')
+        self.assertEqual(test_object0.two, 'two0')
+
+        test_object1 = TestObjectFactory.build()
+        self.assertEqual(test_object1.one, 'one1')
+        self.assertEqual(test_object1.two, 'two1')
+
+    def testSequenceCustomBegin(self):
+        class TestObjectFactory(factory.Factory):
+            @classmethod
+            def _setup_next_sequence(cls):
+                return 42
+
+            one = factory.Sequence(lambda n: 'one' + n)
+            two = factory.Sequence(lambda n: 'two' + n)
+
+        test_object0 = TestObjectFactory.build()
+        self.assertEqual('one42', test_object0.one)
+        self.assertEqual('two42', test_object0.two)
+
+        test_object1 = TestObjectFactory.build()
+        self.assertEqual('one43', test_object1.one)
+        self.assertEqual('two43', test_object1.two)
+
+    def testLazyAttribute(self):
+        class TestObjectFactory(factory.Factory):
+            one = factory.LazyAttribute(lambda a: 'abc' )
+            two = factory.LazyAttribute(lambda a: a.one + ' xyz')
+
+        test_object = TestObjectFactory.build()
+        self.assertEqual(test_object.one, 'abc')
+        self.assertEqual(test_object.two, 'abc xyz')
+
+    def testLazyAttributeSequence(self):
+        class TestObjectFactory(factory.Factory):
+            one = factory.LazyAttributeSequence(lambda a, n: 'abc' + n)
+            two = factory.LazyAttributeSequence(lambda a, n: a.one + ' xyz' + n)
+
+        test_object0 = TestObjectFactory.build()
+        self.assertEqual(test_object0.one, 'abc0')
+        self.assertEqual(test_object0.two, 'abc0 xyz0')
+
+        test_object1 = TestObjectFactory.build()
+        self.assertEqual(test_object1.one, 'abc1')
+        self.assertEqual(test_object1.two, 'abc1 xyz1')
+
+    def testLazyAttributeDecorator(self):
+        class TestObjectFactory(factory.Factory):
+            @factory.lazy_attribute
+            def one(a):
+                return 'one'
+
+        test_object = TestObjectFactory.build()
+        self.assertEqual(test_object.one, 'one')
+
+    def testSelfAttribute(self):
+        class TestObjectFactory(factory.Factory):
+            one = 'xx'
+            two = factory.SelfAttribute('one')
+
+        test_object = TestObjectFactory.build(one=1)
+        self.assertEqual(1, test_object.two)
+
+    def testSequenceDecorator(self):
+        class TestObjectFactory(factory.Factory):
+            @factory.sequence
+            def one(n):
+                return 'one' + n
+
+        test_object = TestObjectFactory.build()
+        self.assertEqual(test_object.one, 'one0')
+
+    def testLazyAttributeSequenceDecorator(self):
+        class TestObjectFactory(factory.Factory):
+            @factory.lazy_attribute_sequence
+            def one(a, n):
+                return 'one' + n
+            @factory.lazy_attribute_sequence
+            def two(a, n):
+                return a.one + ' two' + n
+
+        test_object = TestObjectFactory.build()
+        self.assertEqual(test_object.one, 'one0')
+        self.assertEqual(test_object.two, 'one0 two0')
+
+    def testBuildWithParameters(self):
+        class TestObjectFactory(factory.Factory):
+            one = factory.Sequence(lambda n: 'one' + n)
+            two = factory.Sequence(lambda n: 'two' + n)
+
+        test_object0 = TestObjectFactory.build(three='three')
+        self.assertEqual(test_object0.one, 'one0')
+        self.assertEqual(test_object0.two, 'two0')
+        self.assertEqual(test_object0.three, 'three')
+
+        test_object1 = TestObjectFactory.build(one='other')
+        self.assertEqual(test_object1.one, 'other')
+        self.assertEqual(test_object1.two, 'two1')
+
+    def testCreate(self):
+        class TestModelFactory(factory.Factory):
+            one = 'one'
+
+        test_model = TestModelFactory.create()
+        self.assertEqual(test_model.one, 'one')
+        self.assertTrue(test_model.id)
+
+    def testInheritance(self):
+        class TestObjectFactory(factory.Factory):
+            one = 'one'
+            two = factory.LazyAttribute(lambda a: a.one + ' two')
+
+        class TestObjectFactory2(TestObjectFactory):
+            FACTORY_FOR = TestObject
+
+            three = 'three'
+            four = factory.LazyAttribute(lambda a: a.three + ' four')
+
+        test_object = TestObjectFactory2.build()
+        self.assertEqual(test_object.one, 'one')
+        self.assertEqual(test_object.two, 'one two')
+        self.assertEqual(test_object.three, 'three')
+        self.assertEqual(test_object.four, 'three four')
+
+        test_object_alt = TestObjectFactory.build()
+        self.assertEqual(None, test_object_alt.three)
+
+    def testInheritanceWithInheritedClass(self):
+        class TestObjectFactory(factory.Factory):
+            one = 'one'
+            two = factory.LazyAttribute(lambda a: a.one + ' two')
+
+        class TestFactory(TestObjectFactory):
+            three = 'three'
+            four = factory.LazyAttribute(lambda a: a.three + ' four')
+
+        test_object = TestFactory.build()
+        self.assertEqual(test_object.one, 'one')
+        self.assertEqual(test_object.two, 'one two')
+        self.assertEqual(test_object.three, 'three')
+        self.assertEqual(test_object.four, 'three four')
+
+    def testDualInheritance(self):
+        class TestObjectFactory(factory.Factory):
+            one = 'one'
+
+        class TestOtherFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+            two = 'two'
+            four = 'four'
+
+        class TestFactory(TestObjectFactory, TestOtherFactory):
+            three = 'three'
+
+        obj = TestFactory.build(two=2)
+        self.assertEqual('one', obj.one)
+        self.assertEqual(2, obj.two)
+        self.assertEqual('three', obj.three)
+        self.assertEqual('four', obj.four)
+
+    def testSetCreationFunction(self):
+        def creation_function(class_to_create, **kwargs):
+            return "This doesn't even return an instance of {0}".format(class_to_create.__name__)
+
+        class TestModelFactory(factory.Factory):
+            pass
+
+        TestModelFactory.set_creation_function(creation_function)
+
+        test_object = TestModelFactory.create()
+        self.assertEqual(test_object, "This doesn't even return an instance of TestModel")
+
+
+class SubFactoryTestCase(unittest.TestCase):
+    def testSubFactory(self):
+        class TestModel2(FakeDjangoModel):
+            pass
+
+        class TestModelFactory(factory.Factory):
+            FACTORY_FOR = TestModel
+            one = 3
+
+        class TestModel2Factory(factory.Factory):
+            FACTORY_FOR = TestModel2
+            two = factory.SubFactory(TestModelFactory, one=1)
+
+        test_model = TestModel2Factory(two__one=4)
+        self.assertEqual(4, test_model.two.one)
+        self.assertEqual(1, test_model.id)
+        self.assertEqual(1, test_model.two.id)
+
+    def testSubFactoryWithLazyFields(self):
+        class TestModel2(FakeDjangoModel):
+            pass
+
+        class TestModelFactory(factory.Factory):
+            FACTORY_FOR = TestModel
+
+        class TestModel2Factory(factory.Factory):
+            FACTORY_FOR = TestModel2
+            two = factory.SubFactory(TestModelFactory,
+                                          one=factory.Sequence(lambda n: 'x%sx' % n),
+                                          two=factory.LazyAttribute(
+                                              lambda o: '%s%s' % (o.one, o.one)))
+
+        test_model = TestModel2Factory(one=42)
+        self.assertEqual('x0x', test_model.two.one)
+        self.assertEqual('x0xx0x', test_model.two.two)
+
+    def testSubFactoryOverriding(self):
+        class TestObject(object):
+            def __init__(self, **kwargs):
+                for k, v in kwargs.iteritems():
+                    setattr(self, k, v)
+
+        class TestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+        class WrappingTestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+            wrapped = factory.SubFactory(TestObjectFactory, two=2, four=4)
+            wrapped__two = 4
+            wrapped__three = 3
+
+        wrapping = WrappingTestObjectFactory.build()
+        self.assertEqual(wrapping.wrapped.two, 4)
+        self.assertEqual(wrapping.wrapped.three, 3)
+        self.assertEqual(wrapping.wrapped.four, 4)
+
+
+    def testNestedSubFactory(self):
+        """Test nested sub-factories."""
+
+        class TestObject(object):
+            def __init__(self, **kwargs):
+                for k, v in kwargs.iteritems():
+                    setattr(self, k, v)
+
+        class TestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+        class WrappingTestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+            wrapped = factory.SubFactory(TestObjectFactory)
+            wrapped_bis = factory.SubFactory(TestObjectFactory, one=1)
+
+        class OuterWrappingTestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+            wrap = factory.SubFactory(WrappingTestObjectFactory, wrapped__two=2)
+
+        outer = OuterWrappingTestObjectFactory.build()
+        self.assertEqual(outer.wrap.wrapped.two, 2)
+        self.assertEqual(outer.wrap.wrapped_bis.one, 1)
+
+    def testNestedSubFactoryWithOverriddenSubFactories(self):
+        """Test nested sub-factories, with attributes overridden with subfactories."""
+
+        class TestObject(object):
+            def __init__(self, **kwargs):
+                for k, v in kwargs.iteritems():
+                    setattr(self, k, v)
+
+        class TestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+            two = 'two'
+
+        class WrappingTestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+            wrapped = factory.SubFactory(TestObjectFactory)
+            friend = factory.LazyAttribute(lambda o: o.wrapped.two.four + 1)
+
+        class OuterWrappingTestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+            wrap = factory.SubFactory(WrappingTestObjectFactory,
+                    wrapped__two=factory.SubFactory(TestObjectFactory, four=4))
+
+        outer = OuterWrappingTestObjectFactory.build()
+        self.assertEqual(outer.wrap.wrapped.two.four, 4)
+        self.assertEqual(outer.wrap.friend, 5)
+
+    def testSubFactoryAndInheritance(self):
+        """Test inheriting from a factory with subfactories, overriding."""
+        class TestObject(object):
+            def __init__(self, **kwargs):
+                for k, v in kwargs.iteritems():
+                    setattr(self, k, v)
+
+        class TestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+            two = 'two'
+
+        class WrappingTestObjectFactory(factory.Factory):
+            FACTORY_FOR = TestObject
+
+            wrapped = factory.SubFactory(TestObjectFactory)
+            friend = factory.LazyAttribute(lambda o: o.wrapped.two + 1)
+
+        class ExtendedWrappingTestObjectFactory(WrappingTestObjectFactory):
+            wrapped__two = 4
+
+        wrapping = ExtendedWrappingTestObjectFactory.build()
+        self.assertEqual(wrapping.wrapped.two, 4)
+        self.assertEqual(wrapping.friend, 5)
+
+    def testDiamondSubFactory(self):
+        """Tests the case where an object has two fields with a common field."""
+        class InnerMost(object):
+            def __init__(self, a, b):
+                self.a = a
+                self.b = b
+
+        class SideA(object):
+            def __init__(self, inner_from_a):
+                self.inner_from_a = inner_from_a
+
+        class SideB(object):
+            def __init__(self, inner_from_b):
+                self.inner_from_b = inner_from_b
+
+        class OuterMost(object):
+            def __init__(self, foo, side_a, side_b):
+                self.foo = foo
+                self.side_a = side_a
+                self.side_b = side_b
+
+        class InnerMostFactory(factory.Factory):
+            FACTORY_FOR = InnerMost
+            a = 15
+            b = 20
+
+        class SideAFactory(factory.Factory):
+            FACTORY_FOR = SideA
+            inner_from_a = factory.SubFactory(InnerMostFactory, a=20)
+
+        class SideBFactory(factory.Factory):
+            FACTORY_FOR = SideB
+            inner_from_b = factory.SubFactory(InnerMostFactory, b=15)
+
+        class OuterMostFactory(factory.Factory):
+            FACTORY_FOR = OuterMost
+
+            foo = 30
+            side_a = factory.SubFactory(SideAFactory,
+                inner_from_a__a=factory.LazyContainerAttribute(lambda obj, containers: containers[1].foo * 2))
+            side_b = factory.SubFactory(SideBFactory,
+                inner_from_b=factory.LazyContainerAttribute(lambda obj, containers: containers[0].side_a.inner_from_a))
+
+        outer = OuterMostFactory.build()
+        self.assertEqual(outer.foo, 30)
+        self.assertEqual(outer.side_a.inner_from_a, outer.side_b.inner_from_b)
+        self.assertEqual(outer.side_a.inner_from_a.a, outer.foo * 2)
+        self.assertEqual(outer.side_a.inner_from_a.b, 20)
+
+        outer = OuterMostFactory.build(side_a__inner_from_a__b = 4)
+        self.assertEqual(outer.foo, 30)
+        self.assertEqual(outer.side_a.inner_from_a, outer.side_b.inner_from_b)
+        self.assertEqual(outer.side_a.inner_from_a.a, outer.foo * 2)
+        self.assertEqual(outer.side_a.inner_from_a.b, 4)
+
+
+if __name__ == '__main__':
+    unittest.main()