Move test into correct file

Author: bprobert97

tests/test_cli_debug.py

@@ -20,6 +20,7 @@
 import labthings_fastapi as lt
 from labthings_fastapi.exceptions import LogConfigurationError
 from labthings_fastapi.testing import create_thing_without_server
+from labthings_fastapi.server.cli import serve_from_cli
 
 from .temp_client import poll_task
 
@@ -168,6 +169,34 @@ def test_configure_thing_logger():
         assert len(dest) == 1
         assert dest[0].msg == "Test"
 
+def test_cli_debug_flag():
+    """
+    Test that using the --debug flag sets the logger level to DEBUG,
+    and that not using it leaves the logger level at INFO.
+    """
+    # Reset logger level to NOTSET
+    reset_thing_logger()
+
+    # Then configure it
+    logs.configure_thing_logger()
+
+    # Run without --debug
+    # We use dry_run=True to avoid starting uvicorn
+    # We need a dummy config
+    dummy_json = '{"things": {}}'
+    serve_from_cli(["--json", dummy_json], dry_run=True)
+
+    assert logs.THING_LOGGER.level == logging.INFO
+
+    reset_thing_logger()
+
+    # Run with --debug
+    serve_from_cli(["--json", dummy_json, "--debug"], dry_run=True)
+
+    assert logs.THING_LOGGER.level == logging.DEBUG
+
+    reset_thing_logger()
+
 
 def test_add_thing_log_destination():
     """Check the module-level function to add an invocation log destination."""