courses: combine nested with-statements in the new course tests (ruff SIM117)

Co-authored-by: P小二 <xxg1413@gmail.com>

Author: cursoragent

courses/llm-features-in-python/tests/test_ticket_triage.py

@@ -64,9 +64,8 @@ def test_parse_rejects_missing_extra_and_mistyped_fields(self) -> None:
                     ticket_triage.parse_triage(raw, CATEGORIES)
                 self.assertIn(field, str(caught.exception))
         for raw in ("Sure! Category: billing.", "[]", reply(summary="x" * 121)):
-            with self.subTest(raw=raw[:20]):
-                with self.assertRaises(ticket_triage.TriageError):
-                    ticket_triage.parse_triage(raw, CATEGORIES)
+            with self.subTest(raw=raw[:20]), self.assertRaises(ticket_triage.TriageError):
+                ticket_triage.parse_triage(raw, CATEGORIES)
 
 
 class ToolCallTest(unittest.TestCase):

courses/secure-ai-generated-code/tests/test_notes_app.py

@@ -74,9 +74,8 @@ def test_attachment_inside_base_is_read(self) -> None:
 
     def test_attachment_traversal_is_refused(self) -> None:
         for name in ("../secrets.txt", "docs/../../secrets.txt"):
-            with self.subTest(name=name):
-                with self.assertRaises(notes_app.SecurityError):
-                    notes_app.read_attachment(self.base, name)
+            with self.subTest(name=name), self.assertRaises(notes_app.SecurityError):
+                notes_app.read_attachment(self.base, name)
 
     def test_absolute_attachment_path_is_refused(self) -> None:
         with self.assertRaises(notes_app.SecurityError):
@@ -141,9 +140,8 @@ def test_tampered_or_foreign_session_is_refused(self) -> None:
         flipped = ("A" if token[0] != "A" else "B") + token[1:]
         non_ascii = token.rpartition(".")[0] + ".é" + token.rpartition(".")[2][1:]
         for bad in (forged, flipped, non_ascii, "", "no-signature-here"):
-            with self.subTest(token=bad[:16]):
-                with self.assertRaises(notes_app.SecurityError):
-                    notes_app.load_session(bad, self.key)
+            with self.subTest(token=bad[:16]), self.assertRaises(notes_app.SecurityError):
+                notes_app.load_session(bad, self.key)
 
     def test_pickle_payload_is_never_executed(self) -> None:
         with tempfile.TemporaryDirectory() as tmp: