Test database creation order problem after r14696

[Russell Keith-Magee]

r14696 added a fix for #14415, changing the way test databases are created to ensure that the test setup/teardown process doesn't accidentally destroy the original source database.

However, in the process, it made the test database creation order subject to dictionary ordering. This is problematic because some database have dependencies on other databases during creation.

For example, Django's own test suite won't run if 'other' is created before 'default' because the post_syncdb signal causes a ContentTypes query to be issued, which will try to execute on the default database. If the default database hasn't been created, an error arises.

This is currently causing the buildbots to fail for Postgres.

[Russell Keith-Magee]

Draft fix for problem.

[Russell Keith-Magee]

Here's a draft fix for the problem -- it introduces the concept of TEST_DEPENDENCIES, so you can specify which databases must be synchronized before others. By default, every database is assumed to be dependent on 'default' (except, of course, for default itself). This seems to be enough to make Django's test suite run.

[Jacob]

(In [14756]) Ensured that the test suite creates the default DB before any others.

Refs #14799. Technically this fixes the problem, but I'm far from convinced
it's the perfect solution, so I'm leaving the ticket open. I'm committing
this now because it's the minimum required to get the test suite running
again, but this commit can -- and probably should -- be reverted in favor of
a more holistic fix later on.

[Jacob]

(In [14757]) [1.2.X] Ensured that the test suite creates the default DB before any others.

Refs #14799. Backport of [14756], and see the note there for a caveat.

[Russell Keith-Magee]

(In [14822]) Fixed #14799 -- Provided a full solution for test database creation order problems.

[Russell Keith-Magee]

(In [14825]) [1.2.X] Fixed #14799 -- Provided a full solution for test database creation order problems.

Backport of r14822, r14823 and r14824 from trunk.

[Jacob]

Milestone 1.3 deleted