Update picamera tests to use new test environment

hardware-specific-tests/picamera2/cam_test_utils.py

@@ -0,0 +1,37 @@
+"""Utilities to help with testing the camera."""
+
+from contextlib import contextmanager
+from typing import Optional
+
+from openflexure_microscope_server.things.camera.picamera import StreamingPiCamera2
+
+from ..tests.utilities.lt_test_utils import LabThingsTestEnv
+
+
+@contextmanager
+def camera_test_env(settings_folder: Optional[str] = None):
+    """Yield a test environment with a server that contains just the camera.
+
+    This is a context manager, not a pytest fixture, as it needs to be created
+    multiple times in some tests.
+
+    :param settings_folder: The settings folder for the camera, if none is supplied, new
+        temporary directory will be used as the settings folder.
+    """
+    thing_conf = {"camera": StreamingPiCamera2}
+    with LabThingsTestEnv(things=thing_conf, settings_folder=settings_folder) as env:
+        yield env
+
+
+@contextmanager
+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
+    multiple times in some tests.
+
+    :param settings_folder: The settings folder for the camera, if none is supplied, new
+        temporary directory will be used as the settings folder.
+    """
+    with camera_test_env(settings_folder=settings_folder) as env:
+        return env.get_thing_client("camera")

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

@@ -1,53 +0,0 @@
-"""Utilities to help with testing the camera."""
-
-import tempfile
-from contextlib import contextmanager
-from typing import Optional
-
-from fastapi.testclient import TestClient
-
-import labthings_fastapi as lt
-
-
-@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(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
-    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.
-    """
-    with camera_test_client_and_server(
-        settings_folder=settings_folder
-    ) as client_and_server:
-        yield client_and_server[0]

hardware-specific-tests/picamera2/conftest.py

@@ -8,28 +8,14 @@ from .cam_test_utils import camera_test_client_and_server
 
 
 @pytest.fixture
-def picamera_client_and_server() -> lt.ThingClient:
-    """Initialise a test picamera_client and server for the StreamingPiCamera2 Thing.
-
-    This fixture:
-
-    * Sets up a ThingServer,
-    * Registers a StreamingPiCamera2 instance at the "camera" endpoint
-    * Yields a ThingClient and the server for interacting with it during tests.
-    * The picamera thing can be found at server.things["camera"]
-    """
-    with camera_test_client_and_server() as client_and_server:
-        yield client_and_server
+def picamera_test_env() -> lt.ThingClient:
+    """Initialise a test environment with only a StreamingPiCamera2 Thing."""
+    with camera_test_client_and_server() as env:
+        yield env
 
 
 @pytest.fixture
-def picamera_client(picamera_client_and_server) -> lt.ThingClient:
-    """Initialise a test picamera_client for the StreamingPiCamera2 Thing.
-
-    This fixture:
-
-    * Sets up a ThingServer,
-    * Registers a StreamingPiCamera2 instance at the "camera" endpoint
-    * return a ThingClient for interacting with it during tests.
-    """
-    return picamera_client_and_server[0]
+def picamera_client() -> lt.ThingClient:
+    """Initialise a test picamera_client (in a LabThings test env)."""
+    with camera_test_client_and_server() as env:
+        return env.get_thing_client["camera"]

hardware-specific-tests/picamera2/test_calibration.py

@@ -3,13 +3,15 @@
 import tempfile
 from copy import deepcopy
 
+from openflexure_microscope_server.things.camera.picamera import StreamingPiCamera2
+
 from .cam_test_utils import camera_test_client
 
 
-def test_calibration(picamera_client_and_server):
+def test_calibration(picamera_test_env):
     """Check that full auto calibrate completes and set the expected values."""
-    picamera_client, server = picamera_client_and_server
-    picamera_thing = server.things["camera"]
+    picamera_client, server = picamera_test_env.get_thing_client["camera"]
+    picamera_thing = picamera_test_env.get_thing_by_type(StreamingPiCamera2)
     # Check the calibration_required property used by the calibration wizard
     assert picamera_thing.calibration_required
     # Save copy of default tuning file for end of test