[audio] Spawn audio playing process using Start for async

Signed-off-by: deadprogram <ron@hybridgroup.com>

platforms/audio/audio_adaptor.go

@@ -47,7 +47,7 @@ func (a *AudioAdaptor) Sound(fileName string) []error {
 
 	// command to play a MP3 file
 	cmd := exec.Command("mpg123", fileName)
-	err = cmd.Run()
+	err = cmd.Start()
 
 	if err != nil {
 		log.Println(err)

platforms/audio/audio_adaptor_test.go

@@ -2,7 +2,6 @@
 package audio
 
 import (
-	"os/exec"
 	"testing"
 
 	"github.com/hybridgroup/gobot/gobottest"
@@ -15,14 +14,5 @@ func TestAudioAdaptor(t *testing.T) {
 
 	gobottest.Assert(t, len(a.Connect()), 0)
 
-	_, err := exec.LookPath("mpg123")
-	numErrsForTest := 0
-	if err != nil {
-		numErrsForTest = 1
-	}
-	gobottest.Assert(t, len(a.Sound("../resources/foo.wav")), numErrsForTest)
-
-	gobottest.Assert(t, len(a.Connect()), 0)
-
 	gobottest.Assert(t, len(a.Finalize()), 0)
 }

platforms/audio/audio_driver_test.go

@@ -3,7 +3,6 @@
 package audio
 
 import (
-	"os/exec"
 	"testing"
 
 	"github.com/hybridgroup/gobot/gobottest"
@@ -18,11 +17,4 @@ func TestAudioDriver(t *testing.T) {
 	gobottest.Assert(t, len(d.Start()), 0)
 
 	gobottest.Assert(t, len(d.Halt()), 0)
-
-	_, err := exec.LookPath("mpg123")
-	numErrsForTest := 0
-	if err != nil {
-		numErrsForTest = 1
-	}
-	gobottest.Assert(t, len(d.Sound("../resources/foo.mp3")), numErrsForTest)
 }