chore: import upstream snapshot with attribution

apps/backend/tests/unit/test_settings_timeout.py

@@ -0,0 +1,40 @@
+"""Configurable, bounded request timeout (issue #776).
+
+The improve/tailor request timeout must be env-configurable (slow local LLMs
+need more than 240s) but bounded so a stuck request can't hold a worker
+indefinitely, and robust to blank/garbage env values (which must not crash
+startup).
+"""
+
+from app.config import Settings
+
+
+class TestRequestTimeoutSetting:
+    def test_default_is_240(self):
+        assert Settings.model_fields["request_timeout_seconds"].default == 240
+
+    def test_clamps_below_minimum(self):
+        assert Settings(request_timeout_seconds=5).request_timeout_seconds == 30
+
+    def test_clamps_above_maximum(self):
+        assert Settings(request_timeout_seconds=99999).request_timeout_seconds == 1800
+
+    def test_accepts_in_range(self):
+        assert Settings(request_timeout_seconds=900).request_timeout_seconds == 900
+
+    def test_blank_string_falls_back_to_default(self):
+        # A blank env var (REQUEST_TIMEOUT_SECONDS=) must not crash; defaults to 240.
+        assert Settings(request_timeout_seconds="").request_timeout_seconds == 240
+
+    def test_garbage_falls_back_to_default(self):
+        assert Settings(request_timeout_seconds="abc").request_timeout_seconds == 240
+
+    def test_float_string_is_coerced(self):
+        assert Settings(request_timeout_seconds="300.0").request_timeout_seconds == 300
+
+    def test_infinity_falls_back_to_default(self):
+        # int(float("inf")) raises OverflowError — must not crash startup (PR #833 review).
+        assert Settings(request_timeout_seconds="inf").request_timeout_seconds == 240
+
+    def test_nan_falls_back_to_default(self):
+        assert Settings(request_timeout_seconds="nan").request_timeout_seconds == 240