Set propagate to False on "uvicorn" logger (encode#1288)

tests/conftest.py

@@ -15,6 +15,17 @@
 
 from uvicorn.config import LOGGING_CONFIG
 
+# Note: We explicitly turn the propagate on just for tests, because pytest
+# caplog not able to capture no-propagate loggers.
+#
+# And the caplog_for_logger helper also not work on test config cases, because
+# when create Config object, Config.configure_logging will remove caplog.handler.
+#
+# The simple solution is set propagate=True before execute tests.
+#
+# See also: https://github.com/pytest-dev/pytest/issues/3697
+LOGGING_CONFIG["loggers"]["uvicorn"]["propagate"] = True
+
 
 @pytest.fixture
 def tls_certificate_authority() -> trustme.CA:

uvicorn/config.py

@@ -118,7 +118,7 @@
         },
     },
     "loggers": {
-        "uvicorn": {"handlers": ["default"], "level": "INFO"},
+        "uvicorn": {"handlers": ["default"], "level": "INFO", "propagate": False},
         "uvicorn.error": {"level": "INFO"},
         "uvicorn.access": {"handlers": ["access"], "level": "INFO", "propagate": False},
     },