[LG Sound Sync] Test SPDIF status register parsing

hifiberrydsp/lg/soundsync.py

@@ -30,7 +30,12 @@
 from hifiberrydsp.hardware.adau145x import Adau145x
 from hifiberrydsp.filtering.volume import percent2amplification
 from hifiberrydsp import datatools
-from hifiberrydsp.hardware.spi import SpiHandler
+
+try:
+    from hifiberrydsp.hardware.spi import SpiHandler
+    # depends on spidev and is not required to run tests
+except:
+    pass
 
 logger = logging.getLogger("LG Sound Sync")
 

hifiberrydsp/lg/test_soundsync.py

@@ -0,0 +1,19 @@
+from unittest import TestCase
+
+from hifiberrydsp.lg.soundsync import SoundSync
+
+class TestSoundSync(TestCase):
+    def test_parse_volume_with_missing_sound_sync_signature(self):
+        assert SoundSync.parse_volume_from_status(b'\xff\xff\xff\xff\xff\xff') is None
+
+    def test_parse_out_of_range_volume(self):
+        assert SoundSync.parse_volume_from_status(b'\x00\x1f\xff\x04\x8a\x62') is None
+
+    def test_parse_volume_of_0(self):
+        assert SoundSync.parse_volume_from_status(b'\x00\x10\x0f\x04\x8a\x62') == 0
+
+    def test_parse_volume_of_50(self):
+        assert SoundSync.parse_volume_from_status(b'\x00\x13\x2f\x04\x8a\x62') == 50
+
+    def test_parse_volume_of_100(self):
+        assert SoundSync.parse_volume_from_status(b'\x00\x16\x4f\x04\x8a\x62') == 100