Add timeout around `test_one_end_stream_not_opened()` body

tests/test_context_stream_semantics.py

@@ -845,7 +845,10 @@ async def keep_sending_from_callee(
         ('caller', 1, never_open_stream),
         ('callee', 0, keep_sending_from_callee),
     ],
-    ids='overrun_condition={}'.format,
+    ids=[
+         ('caller_1buf_never_open_stream'),
+         ('callee_0buf_keep_sending_from_callee'),
+    ]
 )
 def test_one_end_stream_not_opened(
     overrun_by: tuple[str, int, Callable],
@@ -869,6 +872,7 @@ def test_one_end_stream_not_opened(
                 enable_modules=[__name__],
             )
 
+            with trio.fail_after(1):
                 async with portal.open_context(
                     entrypoint,
                 ) as (ctx, sent):