fix tests sample

tracim/scripts/initializedb.py

 
         model = MyModel(name='one', value=1)
         dbsession.add(model)
+
+        ### Add global manager data, just for test

tracim/tests.py

         self.session = get_tm_session(session_factory, transaction.manager)
 
     def init_database(self):
-        from .models.meta import Base
-        Base.metadata.create_all(self.engine)
+        from .models.meta import DeclarativeBase
+        DeclarativeBase.metadata.create_all(self.engine)
 
     def tearDown(self):
-        from .models.meta import Base
+        from .models.meta import DeclarativeBase
 
         testing.tearDown()
         transaction.abort()
-        Base.metadata.drop_all(self.engine)
+        DeclarativeBase.metadata.drop_all(self.engine)
 
 
 class TestMyViewSuccessCondition(BaseTest):