Test that null communicator conforms to interface

communicator/none/communicator_test.go

@@ -0,0 +1,16 @@
+package none
+
+import (
+	"testing"
+
+	"github.com/mitchellh/packer/packer"
+)
+
+func TestCommIsCommunicator(t *testing.T) {
+	var raw interface{}
+	raw = &comm{}
+	if _, ok := raw.(packer.Communicator); !ok {
+		t.Fatalf("comm must be a communicator")
+	}
+}
+