add basic tests

tests/run_tests.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -ex
+
+# a quick PCM API test
+str=$(aplay -L | grep -E "^null$")
+if [ "$str" != "null" ]; then
+  echo "The 'null' pcm plugin was not found!"
+  exit 99
+fi

tests/tests.yml

@@ -0,0 +1,11 @@
+- hosts: localhost
+  roles:
+    - role: standard-test-basic
+      tags:
+        - classic
+      required_packages:
+        - alsa-utils
+      tests:
+        - simple:
+            dir: .
+            run: ./run_tests.sh