pytests: test_audio: check existence of both modem and codec cards

pytests/test_audio.py

@@ -26,6 +26,11 @@ def test_wm8962():
     assert b"[wm8962]" in out
 
 
+def test_codec_and_modem_cards_exist():
+    assert(os.path.exists('/sys/class/sound/card0'))
+    assert(os.path.exists('/sys/class/sound/card1'))
+
+
 def test_headphone_detection():
     "Check if we registered the headphone detection IRQ"
     f = open("/proc/interrupts")