---
upgrade:
  - |
    The following test fixtures and base test classes were deprecated and have
    now been removed:

    - ``oslo_db.sqlalchemy.test_base.DbFixture``
    - ``oslo_db.sqlalchemy.test_base.DbTestCase``
    - ``oslo_db.sqlalchemy.test_base.OpportunisticTestCase``
    - ``oslo_db.sqlalchemy.test_base.MySQLOpportunisticFixture``
    - ``oslo_db.sqlalchemy.test_base.PostgreSQLOpportunisticFixture``
    - ``oslo_db.sqlalchemy.test_base.MySQLOpportunisticTestCase``
    - ``oslo_db.sqlalchemy.test_base.PostgreSQLOpportunisticTestCase``

    They have all been replaced by equivalent test fixtures and test class
    mixins in ``oslo_db.sqlalchemy.test_fixtures``.

    In addition, the following test cases were being inadvertently used
    publicly despite being private to oslo.db. They were also deprecated and
    have now been removed:

    - ``oslo_db.tests.sqlalchemy.base.DbTestCase``
    - ``oslo_db.tests.sqlalchemy.base.MySQLOpportunisticTestCase``
    - ``oslo_db.tests.sqlalchemy.base.PostgreSQLOpportunisticTestCase``
