after all that, use pytest warnings plugin

The warnings plugin lets us set the filters up
in the config, and as our filter requirements are now
simple we can just set this up.

additionally pytest now recommends pyproject.toml, since
we fully include this now, let's move it there.

the pytest logging plugin seems to not be any problem either
at the moment, so re-enable that.  if it becomes apparent
whatever the problem was (which was probably that it was just
surprising, or something) we can disable it again and comment
what the reason was.

Change-Id: Ia9715533b01f72aa5fdcf6a27ce75b76f829fa43

1 files changed, 7 insertions, 35 deletions

diff --git a/lib/sqlalchemy/testing/warnings.py b/lib/sqlalchemy/testing/warnings.py
index 1c2039602..2d65e68ec 100644
--- a/lib/sqlalchemy/testing/warnings.py
+++ b/lib/sqlalchemy/testing/warnings.py
@@ -4,54 +4,26 @@
 #
 # This module is part of SQLAlchemy and is released under
 # the MIT License: https://www.opensource.org/licenses/mit-license.php
-import warnings
-
 from . import assertions
 from .. import exc as sa_exc
+from ..exc import SATestSuiteWarning
 from ..util.langhelpers import _warnings_warn
 
 
-class SATestSuiteWarning(Warning):
-    """warning for a condition detected during tests that is non-fatal
-
-    Currently outside of SAWarning so that we can work around tools like
-    Alembic doing the wrong thing with warnings.
-
-    """
-
-
 def warn_test_suite(message):
     _warnings_warn(message, category=SATestSuiteWarning)
 
 
 def setup_filters():
-    """Set global warning behavior for the test suite."""
-
-    # TODO: at this point we can use the normal pytest warnings plugin,
-    # if we decide the test suite can be linked to pytest only
-
-    origin = r"^(?:test|sqlalchemy)\..*"
+    """hook for setting up warnings filters.
 
-    warnings.filterwarnings(
-        "ignore", category=sa_exc.SAPendingDeprecationWarning
-    )
-    warnings.filterwarnings("error", category=sa_exc.SADeprecationWarning)
-    warnings.filterwarnings("error", category=sa_exc.SAWarning)
+    Note that when the pytest warnings plugin is in place, that plugin
+    overwrites whatever happens here.
 
-    warnings.filterwarnings("always", category=SATestSuiteWarning)
+    Current SQLAlchemy 2.0 default is to use pytest warnings plugin
+    which is configured in pyproject.toml.
 
-    warnings.filterwarnings(
-        "error", category=DeprecationWarning, module=origin
-    )
-
-    try:
-        import pytest
-    except ImportError:
-        pass
-    else:
-        warnings.filterwarnings(
-            "once", category=pytest.PytestDeprecationWarning, module=origin
-        )
+    """
 
 
 def assert_warnings(fn, warning_msgs, regex=False):