Add release note for base test class removal

In change I1e71150ba6daeba464b6ed8d46163f1f34959db3 we removed the
legacy base test classes, first deprecated in 2015. We forgot to include
a release note, however. Address this now.

Change-Id: I4d66f0308b89a187143ef6c8495383fe60043c14
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/releasenotes/notes/remove-base-test-classes-557889ec4f072781.yaml b/releasenotes/notes/remove-base-test-classes-557889ec4f072781.yaml
new file mode 100644
index 0000000..1fb1381
--- /dev/null
+++ b/releasenotes/notes/remove-base-test-classes-557889ec4f072781.yaml
@@ -0,0 +1,24 @@
+---
+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+    They have all been replaced by equivalent test fixtures and test class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``