Reemit deprecation warnings from `pytest.warns`

Only suppress deprecations explicitly stated in `expected_warning` argument.

changelog/9288.improvement.rst

@@ -0,0 +1 @@
+``pytest.warns`` no longer suppresses warnings derived from ``DeprecationWarning`` and ``PendingDeprecationWarning`` by default.

src/_pytest/recwarn.py

@@ -292,6 +292,15 @@ class WarningsChecker(WarningsRecorder):
 
         # only check if we're not currently handling an exception
         if exc_type is None and exc_val is None and exc_tb is None:
+            for w in self:
+                reemit = {DeprecationWarning, PendingDeprecationWarning}
+                if self.expected_warning is not None:
+                    reemit -= set(self.expected_warning)
+                if issubclass(w.category, tuple(reemit)):
+                    warnings.showwarning(
+                        w.message, w.category, w.filename, w.lineno, w.file, w.line
+                    )
+
             if self.expected_warning is not None:
                 if not any(issubclass(r.category, self.expected_warning) for r in self):
                     __tracebackhide__ = True

testing/test_recwarn.py

@@ -83,6 +83,20 @@ class TestWarningsRecorderChecker:
                     with rec:
                         pass  # can't enter twice
 
+    def test_no_suppress_deprecation_warnings(self) -> None:
+        with warnings.catch_warnings(record=True) as record:
+            warnings.simplefilter("always")
+            with pytest.warns(DeprecationWarning), pytest.warns(
+                PendingDeprecationWarning
+            ):
+                with pytest.warns(UserWarning):
+                    warnings.warn("my warning", UserWarning)
+                    warnings.warn("some deprecation warning", DeprecationWarning)
+                    warnings.warn(
+                        "other deprecation warning", PendingDeprecationWarning
+                    )
+            assert len(record) == 0
+
 
 class TestDeprecatedCall:
     """test pytest.deprecated_call()"""
@@ -217,6 +231,14 @@ class TestDeprecatedCall:
             with pytest.deprecated_call(match=r"must be \d+$"):
                 warnings.warn("this is not here", DeprecationWarning)
 
+    def test_suppress_deprecation_warnings(self) -> None:
+        with warnings.catch_warnings(record=True) as record:
+            warnings.simplefilter("always")
+            with pytest.deprecated_call():
+                warnings.warn("some deprecation warning", DeprecationWarning)
+                warnings.warn("other deprecation warning", PendingDeprecationWarning)
+            assert len(record) == 0
+
 
 class TestWarns:
     def test_check_callable(self) -> None: