Fixing up tests

Some unencoded formats are *huge* (like BGRA) and on older Pi's this can
cause huge IO bottlenecks leading to common test failures, so bump the
minimum split-point wait timeout to 10 seconds.

Fixed up the image-effect test cleanup, and tweaked AWB gains test
(marginal failures on slow platforms - needed longer testing delay).
Finally, added missing warnings import.

picamera/encoders.py

@@ -979,9 +979,9 @@ def split(self, output, motion_output=None):
         # intra_period / framerate gives the time between I-frames (which
         # should also coincide with SPS headers). We multiply by three to
         # ensure the timeout is deliberately excessive, and clamp the minimum
-        # timeout to 1 second (otherwise unencoded formats tend to fail
+        # timeout to 10 seconds (otherwise unencoded formats tend to fail
         # presumably due to I/O capacity)
-        timeout = max(1.0, float(self._intra_period / self.parent.framerate) * 3.0)
+        timeout = max(10.0, float(self._intra_period / self.parent.framerate) * 3.0)
         if not self.event.wait(timeout):
             raise PiCameraRuntimeError(
                 'Timed out waiting for a split point')

picamera/frames.py

@@ -37,6 +37,7 @@
 # Make Py2's str and range equivalent to Py3's
 str = type('')
 
+import warnings
 from collections import namedtuple
 
 from picamera.exc import (

tests/test_attr.py

@@ -142,7 +142,7 @@ def test_awb_gains(camera, previewing):
 
     def check_gains(red, blue):
         # The camera needs some time to let the AWB gains adjust
-        time.sleep(0.1)
+        time.sleep(0.2)
         # The gains we get back aren't absolutely precise, but they're
         # close (+/- 0.05)
         r, b = camera.awb_gains
@@ -235,7 +235,7 @@ def test_image_effects1(camera, previewing):
                     camera.image_effect_params = params
                     assert camera.image_effect_params == params
     finally:
-        camera.effect = 'none'
+        camera.image_effect = 'none'
 
 def test_image_effects2(camera, previewing):
     invalid_combinations = {