Consolidate the BaseCamera, CameraStub, and CameraProtocol, move StreamingPiCamera2 to this repo

hardware-specific-tests/picamera2/test_exposure_time_drift.py

@@ -0,0 +1,32 @@
+import logging
+import time
+
+from fastapi.testclient import TestClient
+
+from labthings_fastapi.server import ThingServer
+from labthings_fastapi.client import ThingClient
+from labthings_picamera2.thing import StreamingPiCamera2
+
+logging.basicConfig(level=logging.DEBUG)
+
+
+def test_exposure_time_drift():
+    cam = StreamingPiCamera2()
+    server = ThingServer()
+    server.add_thing(cam, "/camera/")
+
+    with TestClient(server.app) as test_client:
+        client = ThingClient.from_url("/camera/", client=test_client)
+        client.exposure_time = 50000
+        time.sleep(0.1)
+        initial_et = client.exposure_time
+        print(f"Before capture, et is {client.exposure_time}")
+        for i in range(10):
+            client.capture_jpeg(resolution="full")
+            print(f"After capture, et is {client.exposure_time}")
+        final_et = client.exposure_time
+        assert initial_et == final_et
+
+
+if __name__ == "__main__":
+    test_exposure_time_drift()