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+# testing/warnings.py
+# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+
+import warnings
+
+from sqlalchemy import exc as sa_exc
+
+
+def setup_filters():
+    """Set global warning behavior for the test suite."""
+
+    warnings.resetwarnings()
+
+    warnings.filterwarnings("error", category=sa_exc.SADeprecationWarning)
+    warnings.filterwarnings("error", category=sa_exc.SAWarning)
+
+    # some selected deprecations...
+    warnings.filterwarnings("error", category=DeprecationWarning)
+
+    # Python 3.15 emits this from linecache when a traceback is formatted
+    # for a frame belonging to a module that has no __spec__, which is the
+    # case for Mako's string-based template modules.  Fixed in Mako via
+    # https://github.com/sqlalchemy/mako/issues/437; remove this filter
+    # once a Mako release including that fix is required.
+    warnings.filterwarnings(
+        "ignore",
+        r"Module globals is missing a __spec__\.loader",
+        DeprecationWarning,
+    )
+
+    try:
+        import pytest
+    except ImportError:
+        pass
+    else:
+        warnings.filterwarnings(
+            "once", category=pytest.PytestDeprecationWarning
+        )