Added unit tests for audio, with an associated sample file (short, an…

…d made it `.ogg` for easy compatibility, so big :(). See kivy#467

kivy/tests/test_audio.py

@@ -0,0 +1,62 @@
+'''
+Audio tests
+===========
+'''
+
+import unittest
+import os
+
+SAMPLE_FILE = os.path.join(os.path.dirname(__file__), 'sample1.ogg')
+SAMPLE_LENGTH = 1.402
+SAMPLE_LENGTH_MIN = SAMPLE_LENGTH * 0.99
+SAMPLE_LENGTH_MAX = SAMPLE_LENGTH * 1.01
+
+class AudioTestCase(unittest.TestCase):
+
+    def setUp(self):
+        from kivy.core import audio
+        self.make_sound = audio.SoundLoader.load
+
+    def get_sound(self):
+        import os
+        assert os.path.exists(SAMPLE_FILE)
+        return self.make_sound(filename=SAMPLE_FILE)
+
+    def test_length_simple(self):
+        sound = self.get_sound()
+        length = sound.length
+        assert SAMPLE_LENGTH_MIN <= length <= SAMPLE_LENGTH_MAX
+
+    def test_length_playing(self):
+        import time
+        sound = self.get_sound()
+        sound.play()
+        try:
+            time.sleep(0.1)
+            length = sound.length
+            assert SAMPLE_LENGTH_MIN <= length <= SAMPLE_LENGTH_MAX
+        finally:
+            sound.stop()
+
+    def test_length_stopped(self):
+        import time
+        sound = self.get_sound()
+        sound.play()
+        try:
+            time.sleep(0.1)
+        finally:
+            sound.stop()
+        length = sound.length
+        assert SAMPLE_LENGTH_MIN <= length <= SAMPLE_LENGTH_MAX
+
+class AudioGstreamerTestCase(AudioTestCase):
+    def setUp(self):
+        from kivy.core.audio import audio_gstreamer
+        self.make_sound = audio_gstreamer.SoundGstreamer
+
+class AudioPygameTestCase(AudioTestCase):
+    def setUp(self):
+        from kivy.core.audio import audio_pygame
+        self.make_sound = audio_pygame.SoundPygame
+
+