Dont raise on pytest deprecation warnings

py.test 5.4.0 emits deprecation warnings for pytest.Class.
make sure we don't raise for these, and log the code that will
be used for 5.4.0 when we bump requirements.

Fixes: #5201
Change-Id: I83e0402c4a6b2365a63b58d052c6989df3a37328

2 files changed, 22 insertions, 0 deletions

diff --git a/lib/sqlalchemy/testing/plugin/pytestplugin.py b/lib/sqlalchemy/testing/plugin/pytestplugin.py
index c39f9f32e..f2e7d706f 100644
--- a/lib/sqlalchemy/testing/plugin/pytestplugin.py
+++ b/lib/sqlalchemy/testing/plugin/pytestplugin.py
@@ -160,6 +160,11 @@ def pytest_collection_modifyitems(session, config, items):
             if sub_cls is not test_class.cls:
                 per_cls_dict = rebuilt_items[test_class.cls]
 
+                # in pytest 5.4.0
+                # for inst in pytest.Class.from_parent(
+                #     test_class.parent.parent, name=sub_cls.__name__
+                # ).collect():
+
                 for inst in pytest.Class(
                     sub_cls.__name__, parent=test_class.parent.parent
                 ).collect():
@@ -188,6 +193,14 @@ def pytest_collection_modifyitems(session, config, items):
 def pytest_pycollect_makeitem(collector, name, obj):
 
     if inspect.isclass(obj) and plugin_base.want_class(name, obj):
+
+        # in pytest 5.4.0
+        # return [
+        #     pytest.Class.from_parent(collector,
+        # name=parametrize_cls.__name__)
+        #     for parametrize_cls in _parametrize_cls(collector.module, obj)
+        # ]
+
         return [
             pytest.Class(parametrize_cls.__name__, parent=collector)
             for parametrize_cls in _parametrize_cls(collector.module, obj)
diff --git a/lib/sqlalchemy/testing/warnings.py b/lib/sqlalchemy/testing/warnings.py
index cc11e556c..6b42c98cb 100644
--- a/lib/sqlalchemy/testing/warnings.py
+++ b/lib/sqlalchemy/testing/warnings.py
@@ -34,6 +34,15 @@ def setup_filters():
     # ignore 2.0 warnings unless we are explicitly testing for them
     warnings.filterwarnings("ignore", category=sa_exc.RemovedIn20Warning)
 
+    try:
+        import pytest
+    except ImportError:
+        pass
+    else:
+        warnings.filterwarnings(
+            "once", category=pytest.PytestDeprecationWarning
+        )
+
 
 def assert_warnings(fn, warning_msgs, regex=False):
     """Assert that each of the given warnings are emitted by fn.