tests: Add encoder import test

This ensures the correct default encoder is selected for the running
platform.

Signed-off-by: Naushir Patuck <[email protected]>

Author: naushir

tests/encoder_import.py

@@ -0,0 +1,15 @@
+from picamera2 import Picamera2
+from picamera2.encoders import H264Encoder
+from picamera2.platform import Platform
+
+encoder = H264Encoder(bitrate=1000000)
+encoder_name = encoder.__class__.__name__
+platform = Picamera2.platform
+
+if platform == Platform.VC4:
+    error = encoder_name != "H264Encoder"
+elif platform == Platform.PISP:
+    error = encoder_name != "LibavH264Encoder"
+
+if error:
+    print("ERROR: Unexpected encoder, got", encoder_name, "for platform", platform)