diff --git a/broker/memory_test.go b/broker/memory_test.go
index 25c7cfe1..168c8d16 100644
--- a/broker/memory_test.go
+++ b/broker/memory_test.go
@@ -32,7 +32,7 @@ func TestMemoryBroker(t *testing.T) {
 				"foo": "bar",
 				"id":  fmt.Sprintf("%d", i),
 			},
-			Body: []byte(`hello world`),
+			Body: []byte(`"hello world"`),
 		}
 
 		if err := b.Publish(ctx, topic, message); err != nil {
diff --git a/config/config.go b/config/config.go
index d257849d..6cd4457a 100644
--- a/config/config.go
+++ b/config/config.go
@@ -43,13 +43,13 @@ type Watcher interface {
 }
 
 // Load loads config from config sources
-func Load(ctx context.Context, cs ...Config) error {
+func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
 	var err error
 	for _, c := range cs {
 		if err = c.Init(); err != nil {
 			return err
 		}
-		if err = c.Load(ctx); err != nil {
+		if err = c.Load(ctx, opts...); err != nil {
 			return err
 		}
 	}
diff --git a/util/fn/fn.go b/util/fn/fn.go
new file mode 100644
index 00000000..dd8c1c28
--- /dev/null
+++ b/util/fn/fn.go
@@ -0,0 +1,15 @@
+package fn
+
+type Initer interface {
+	Init(opts ...interface{}) error
+}
+
+func Init(ifaces ...Initer) error {
+	var err error
+	for _, iface := range ifaces {
+		if err = iface.Init(); err != nil {
+			return err
+		}
+	}
+	return nil
+}