tests: Enable SQLAlchemy 2.0 deprecation warnings

Well, sort of. We enable them but immediately filter out the ones we're
actually seeing, the rationale being that we can address these in a
piecemeal fashion without the risk of introducing new issues.

There's a lot more to be done here. However, the work done in oslo.db
[1] should provide a guide for how to resolve the outstanding issues.

[1] https://review.opendev.org/q/topic:"sqlalchemy-20"+project:openstack/oslo.db

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Change-Id: If3a9bed39872012f8c64333cf378c434c22a2d15

manila/test.py

@@ -168,6 +168,37 @@ class WarningsFixture(fixtures.Fixture):
             category=sqla_exc.SADeprecationWarning,
         )
 
+        # ..but filter everything out until we get around to fixing them
+        # TODO(stephenfin): Fix all of these
+
+        warnings.filterwarnings(
+            'ignore',
+            module='manila',
+            message='Using strings to indicate column or relationship paths ',
+            category=sqla_exc.SADeprecationWarning,
+        )
+
+        warnings.filterwarnings(
+            'ignore',
+            module='manila',
+            message='The current statement is being autocommitted ',
+            category=sqla_exc.SADeprecationWarning,
+        )
+
+        warnings.filterwarnings(
+            'ignore',
+            module='manila',
+            message='The autoload parameter is deprecated ',
+            category=sqla_exc.SADeprecationWarning,
+        )
+
+        warnings.filterwarnings(
+            'ignore',
+            module='manila',
+            message='Using strings to indicate relationship names in Query',
+            category=sqla_exc.SADeprecationWarning,
+        )
+
         # Enable general SQLAlchemy warnings also to ensure we're not doing
         # silly stuff. It's possible that we'll need to filter things out here
         # with future SQLAlchemy versions, but that's a good thing

tox.ini

@@ -13,6 +13,8 @@ usedevelop = true
 setenv =
   VIRTUAL_ENV={envdir}
   PYTHONDONTWRITEBYTECODE=1
+# TODO(stephenfin): Remove once we bump our upper-constraint to SQLAlchemy 2.0
+  SQLALCHEMY_WARN_20=1
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt