Rails 3 in test env won't allow records to save, even with latest sqlite3 - ruby-on-rails-3

Question

I saw this post:
Rails/ActiveRecord/SQLite3: Can't save records in test environment
And after upgrading my sqlite version to the very latest (3.7.17), I am still getting the following error:
ActiveRecord::StatementInvalid: SQLite3::SQLException: near "SAVEPOINT": syntax error: SAVEPOINT active_record_1
Any time I try to create anything at all. If all I do is load my fixtures, everything is fine.
I have confirmed that rails is using the updated sqlite3 version by running "rails db".
In my development environment, I can create objects all day long with no errors (I can even have an object create another object after create).
What is special about my test environment that this is happening? How can I fix it?
Edit:
If I delete my test database, and redo rake:db:create and rake:db:migrate, I still get the same issues.
Doing "rails console test" lets me use the test environment just fine, and I can create objects all day long and see existing fixtures. It's only when I type "rake test:units" that I get the errors... (originally I had errors, but one error was legitimate (I don't know why I wasn't getting it in the development environment, and the adapter error was because apparently you aren't supposed to do "rails console RAILS_ENV="test", so it was looking for an adapter for an envrionment called "RAILS_ENV=test")
Edit: When I type "gem uninstall sqlite3" it uninstalls. When I then type "bundle install" it has a problem reinstalling...working on it now.
/home/jenny/.rvm/rubies/ruby-1.9.3-p0/bin/ruby extconf.rb --with-sqlite3-dir=/usr/local/bin/sqlite3 checking for sqlite3.h... *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check
the mkmf.log file for more details. You may need configuration
options.
If I type "gem install sqlite3" separately, it works just fine, and then "bundle install" it works. However, "rake test:units" has the same errors.
Edit:
When I type "which sqlite3" it prints out "/usr/local/bin/sqlite3"
I wasn't even aware sqlite3 headers were a thing, so I doubt I installed them. I'll try to figure out how to confirm this and see if it helps.
Edit:
I don't see anywhere to download sqlite3 headers on the main site...just source and the precompiled linux binary. There doesn't seem to be a special header in the source, but even if there was, wouldn't it be included in the precompiled binary?
EDIT: link to bundler sqlite3 install error that don't happen when i manually install the gem
http://pastie.org/8063577
EDIT: Not a devise problem. I thought it was, but it turned out I was just creating another object in fixtures, not in the test code.
So, I can create devise User or any other type of object in fixtures all day long, but if I attempt to create one in the unit test, I get the save point error. Same thing for trying to save a fixture in a unit test.

Answer 1

Your problem is most likely related to the fact that you updated your local sqlite but after that you haven't reinstalled your sqlite3 gem.
I'd recommend you follow these steps:
Remove the corresponding line gem 'sqlite3' from your Gemfile
Run bundle install
Run gem uninstall sqlite3
Return the line gem 'sqlite3' to your Gemfile
Run bundle install one more time
If you simply gem uninstall and then bundle install, it will install the same version and dependencies that were recorded in Gemfile.lock. But since you're now using a different and more updated local version, it's safer to allow Bundler to install a new version if needed.