added test case

pkg/plugin/definition/publisher.go

@@ -8,6 +8,7 @@ type Publisher interface {
 	Publish(context.Context, string, []byte) error
 }
 
+// PublisherProvider is the interface for creating new Publisher instances.
 type PublisherProvider interface {
 	// New initializes a new publisher instance with the given configuration.
 	New(ctx context.Context, config map[string]string) (Publisher, func() error, error)