Group warnings by message instead of by test id

testing/example_scripts/warnings/test_group_warnings_by_message.py

@@ -0,0 +1,16 @@
+import warnings
+
+import pytest
+
+
+def func():
+    warnings.warn(UserWarning("foo"))
+
+
+@pytest.mark.parametrize("i", range(5))
+def test_foo(i):
+    func()
+
+
+def test_bar():
+    func()