```
ActiveRecord::StatementInvalid: SQLite3::SQLException:
object name reserved for internal use:
sqlite_autoindex_custom_primary_key_records_1:
CREATE UNIQUE INDEX "sqlite_autoindex_custom_primary_key_records_1"
ON "custom_primary_key_records" ("uuid")
```
When a record is inserted into the `versions` table, it is given an `item_type` like `Foo::Bar`, but the association reification queries were searching for an `item_type` like `::Foo::Bar`.
- Convert serializers/mixin_json_test.rb to rspec
- Convert functional/thread_safety_test.rb to rspec
- Convert functional/controller_test.rb to rspec
- Move the dummy app from test to spec, delete test dir