Update the picamera tests for labthings 0.0.12 syntax

hardware-specific-tests/picamera2/cam_test_utils/__init__.py

@@ -8,13 +8,36 @@ from fastapi.testclient import TestClient
 
 import labthings_fastapi as lt
 
-from openflexure_microscope_server.things.camera.picamera import StreamingPiCamera2
+
+@contextmanager
+def camera_test_client_and_server(settings_folder: Optional[str] = None):
+    """Yield a camera ThingClient and the associated camera server.
+
+    This is a context manager, not a pytest fixture, as it needs to be created
+    multiple times in some tests.
+
+    :param cam: The camera Thing to be used. If not supplied a new one will be created.
+    :param settings_folder: The settings folder for the camera, if none is supplied, new
+        temporary directory will be used as the settings folder.
+    """
+    # Create a temp dir, if the setting folder is set it isn't really needed
+    # but doesn't add much overhead.
+    with tempfile.TemporaryDirectory() as tmpdir:
+        if settings_folder is None:
+            settings_folder = tmpdir
+        thing_conf = {
+            "camera": "openflexure_microscope_server.things.camera.picamera:StreamingPiCamera2",
+        }
+        server = lt.ThingServer(things=thing_conf, settings_folder=settings_folder)
+
+        with TestClient(server.app) as test_client:
+            client = lt.ThingClient.from_url("/camera/", client=test_client)
+            yield client, server
+    del server
 
 
 @contextmanager
-def camera_test_client(
-    cam: Optional[StreamingPiCamera2] = None, settings_folder: Optional[str] = None
-):
+def camera_test_client(settings_folder: Optional[str] = None):
     """Yield a camera ThingClient on a camera server.
 
     This is a context manager, not a pytest fixture, as it needs to be created
@@ -24,18 +47,7 @@ def camera_test_client(
     :param settings_folder: The settings folder for the camera, if none is supplied, new
         temporary directory will be used as the settings folder.
     """
-    if cam is None:
-        cam = StreamingPiCamera2()
-    # Create a temp dir, if the setting folder is set it isn't really needed
-    # but doesn't add much overhead.
-    with tempfile.TemporaryDirectory() as tmpdir:
-        if settings_folder is None:
-            settings_folder = tmpdir
-        server = lt.ThingServer(settings_folder=settings_folder)
-        server.add_thing(cam, "camera")
-
-        with TestClient(server.app) as test_client:
-            client = lt.ThingClient.from_url("camera", client=test_client)
-            yield client
-    del server
-    del cam
+    with camera_test_client_and_server(
+        settings_folder=settings_folder
+    ) as client_and_server:
+        yield client_and_server[0]