How to use the workflows.utils.set_workflow function in workflows

# Add all permissions which are managed by the workflow
        wpr = WorkflowPermissionRelation.objects.create(workflow=self.w, permission=self.view)
        wpr = WorkflowPermissionRelation.objects.create(workflow=self.w, permission=self.edit)

        # Add permissions for single states
        spr = StatePermissionRelation.objects.create(state=self.public, permission=self.view, role=self.owner)
        spr = StatePermissionRelation.objects.create(state=self.private, permission=self.view, role=self.owner)
        spr = StatePermissionRelation.objects.create(state=self.private, permission=self.edit, role=self.owner)

        # Add inheritance block for single states
        sib = StateInheritanceBlock.objects.create(state=self.private, permission=self.view)
        sib = StateInheritanceBlock.objects.create(state=self.private, permission=self.edit)
        sib = StateInheritanceBlock.objects.create(state=self.public, permission=self.edit)

        workflows.utils.set_workflow(self.page_1, self.w)

def test_get_objects_for_workflow_3(self):
        """Workflow is added to content type and object.
        """
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [])

        workflows.utils.set_workflow(self.user, self.w)
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [self.user])

        ctype = ContentType.objects.get_for_model(self.user)
        workflows.utils.set_workflow(ctype, self.w)
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [self.user])

def test_workflow(self):
        """
        """
        workflows.utils.set_workflow(self.user, self.w)
        result = workflows.utils.get_workflow(self.user)
        self.assertEqual(result, self.w)

def setUp(self):
        """
        """
        create_workflow(self)
        self.user = User.objects.create(username='test_user',
            first_name='Test', last_name='User')
        self.flat_page = FlatPage.objects.create(url='/page-1', title='Page 1',
            initializer=self.user)

        set_workflow(self.flat_page, self.w)

def test_get_objects_for_workflow_3(self):
        """Workflow is added to content type and object.
        """
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [])

        workflows.utils.set_workflow(self.user, self.w)
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [self.user])

        ctype = ContentType.objects.get_for_model(self.user)
        workflows.utils.set_workflow(ctype, self.w)
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [self.user])

def test_get_objects_for_workflow_1(self):
        """Workflow is added to object.
        """
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [])

        workflows.utils.set_workflow(self.user, self.w)
        result = workflows.utils.get_objects_for_workflow(self.w)
        self.assertEqual(result, [self.user])

def test_by_state(self):
        set_workflow(self.first_page, self.w)
        set_workflow(self.second_page, self.w)
        set_workflow(self.third_page, self.w)

        result = FlatPage.objects.by_state('Private')
        self.assertListEqual(list(result), [self.first_page, self.second_page,
            self.third_page])
        self.assertIsInstance(result, QuerySet)

        self.first_page.change_state(self.make_public, self.user)

        result = FlatPage.objects.by_state('Public')
        self.assertListEqual(list(result), [self.first_page])

def test_by_state(self):
        set_workflow(self.first_page, self.w)
        set_workflow(self.second_page, self.w)
        set_workflow(self.third_page, self.w)

        result = FlatPage.objects.by_state('Private')
        self.assertListEqual(list(result), [self.first_page, self.second_page,
            self.third_page])
        self.assertIsInstance(result, QuerySet)

        self.first_page.change_state(self.make_public, self.user)

        result = FlatPage.objects.by_state('Public')
        self.assertListEqual(list(result), [self.first_page])

def test_get_editable_instances(self):
        """
        """
        second_page = FlatPage.objects.create(url='/page-2', title='Page 2',
                initializer=self.test_user)
        third_page = FlatPage.objects.create(url='/page-3', title='Page 3',
                initializer=self.test_user)
        fourth_page = FlatPage.objects.create(url='/page-4', title='Page 4',
                initializer=self.test_user)
        fifth_page = FlatPage.objects.create(url='/page-5', title='Page 5',
            initializer=self.test_user)

        set_workflow(self.flat_page, self.w)
        set_workflow(second_page, self.w)
        set_workflow(third_page, self.w)

        result = FlatPage.pending.editable_by_roles([self.publisher])
        self.assertListEqual(list(result), [self.flat_page, second_page, 
            third_page])
        result = FlatPage.pending.editable_by_roles([self.anonymous])
        self.assertListEqual(list(result), [])

        self.flat_page.change_state(self.make_public, self.test_user)
        second_page.change_state(self.reject, self.test_user)

        result = FlatPage.pending.editable_by_roles([self.publisher])
        self.assertListEqual(list(result), [third_page])

def test_ended_manager(self):
        set_workflow(self.first_page, self.w)
        set_workflow(self.second_page, self.w)
        set_workflow(self.third_page, self.w)

        result = FlatPage.ended.all()
        self.assertListEqual(list(result), [])

        self.first_page.change_state(self.make_public, self.user)
        self.second_page.change_state(self.reject, self.user)
        result = FlatPage.ended.all()
        self.assertListEqual(list(result), [self.second_page])

        result = result.by_state('Rejected')
        self.assertListEqual(list(result), [self.second_page])