Could you use an in-memory, sqlite db for your testing? For our applications, we have an initialization function that loads the database connection strings from a config (.ini) file, passing those on to create_engine. In production it's a postgresql connection string, for test, it's a "sqlite:///:memory:'
Toph Burns | Software Engineer 5885 Hollis St. Suite 100 Emeryville, CA 94608 510-597-4797 bu...@amyris.com ________________________________ From: sqlalchemy@googlegroups.com [sqlalchemy@googlegroups.com] on behalf of Michel Albert [exh...@gmail.com] Sent: Tuesday, September 10, 2013 1:46 AM To: sqlalchemy@googlegroups.com Subject: [sqlalchemy] Unit testing, mocking and dependency injection with SA Declarative. I am trying to wrap my head around how to do Dependency Injection with SQLAlchemy and I am walking in circles. I want to be able to mock out SA for most of my tests. I trust SA and don't want to test serialisation into the DB. I just want to test my own code. So I was thinking to do dependency injection, and mock out SA during testing. But I don't know what to mock out, how and when to set up the session properly, without doing it at the module level (which causes unwanted side-effects only by importing the module). The only solution which comes to mind is to have one "singleton" which deals with that. But that feels very unpythonic to me and I am wondering if there's a better solution. I also saw that "create_engine" has an optional "module" kwarg, which I could mock out. But then SA begins complaining that the return types are not correct. And I don't want to specify return values for every possible db-module call. That's way out of scope of my tests. I am not calling anything on the db-module. That's SA's job, and, as said, I already trust SA. Whenever I work on this I always run into the session_maker initialisation as well. The examples to this on the module level, which I really make me feel uneasy. Any tips? Just prodding myself in the right direction might help me out enough. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/groups/opt_out.
