Add extra test, changelog improvement

Author: nicoddemus

changelog/13115.improvement.rst

@@ -1,2 +1,8 @@
-Allows supplying ``ExceptionGroup[Exception]`` and ``BaseExceptionGroup[BaseException]`` to ``pytest.raises`` to keep full typing on ExcInfo.
-Parametrizing with other element types remains an error - we do not check the types of child exceptions and thus do not permit code that might look like we do.
+Allows supplying ``ExceptionGroup[Exception]`` and ``BaseExceptionGroup[BaseException]`` to ``pytest.raises`` to keep full typing on :class:`ExceptionInfo <pytest.ExceptionInfo>`:
+
+.. code-block:: python
+
+    with pytest.raises(ExceptionGroup[Exception]) as exc_info:
+        some_function()
+
+Parametrizing with other exception types remains an error - we do not check the types of child exceptions and thus do not permit code that might look like we do.

src/_pytest/python_api.py

@@ -972,6 +972,7 @@ def raises(
         expected_exceptions = expected_exception
 
     def validate_exc(exc: type[E]) -> type[E]:
+        __tracebackhide__ = True
         origin_exc: type[E] | None = get_origin(exc)
         if origin_exc and issubclass(origin_exc, BaseExceptionGroup):
             exc_type = get_args(exc)[0]

testing/code/test_excinfo.py

@@ -455,16 +455,14 @@ def test_division_zero():
 
 
 def test_raises_accepts_generic_group() -> None:
-    exc_group = ExceptionGroup("", [RuntimeError()])
     with pytest.raises(ExceptionGroup[Exception]) as exc_info:
-        raise exc_group
+        raise ExceptionGroup("", [RuntimeError()])
     assert exc_info.group_contains(RuntimeError)
 
 
 def test_raises_accepts_generic_base_group() -> None:
-    exc_group = ExceptionGroup("", [RuntimeError()])
     with pytest.raises(BaseExceptionGroup[BaseException]) as exc_info:
-        raise exc_group
+        raise ExceptionGroup("", [RuntimeError()])
     assert exc_info.group_contains(RuntimeError)
 
 
@@ -474,12 +472,21 @@ def test_raises_rejects_specific_generic_group() -> None:
 
 
 def test_raises_accepts_generic_group_in_tuple() -> None:
-    exc_group = ExceptionGroup("", [RuntimeError()])
     with pytest.raises((ValueError, ExceptionGroup[Exception])) as exc_info:
-        raise exc_group
+        raise ExceptionGroup("", [RuntimeError()])
     assert exc_info.group_contains(RuntimeError)
 
 
+def test_raises_exception_escapes_generic_group() -> None:
+    try:
+        with pytest.raises(ExceptionGroup[Exception]):
+            raise ValueError("my value error")
+    except ValueError as e:
+        assert str(e) == "my value error"
+    else:
+        pytest.fail("Expected ValueError to be raised")
+
+
 class TestGroupContains:
     def test_contains_exception_type(self) -> None:
         exc_group = ExceptionGroup("", [RuntimeError()])