add test for loading from registry for rest of processors

internal/processor/test/midi-message-encode_test.go

@@ -0,0 +1,27 @@
+package processor_test
+
+import (
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"github.com/jwetzell/showbridge-go/internal/processor"
+)
+
+func TestMIDIMessageEncodeFromRegistry(t *testing.T) {
+	registration, ok := processor.ProcessorRegistry["midi.message.encode"]
+	if !ok {
+		t.Fatalf("midi.message.encode processor not registered")
+	}
+
+	processorInstance, err := registration.New(config.ProcessorConfig{
+		Type: "midi.message.encode",
+	})
+
+	if err != nil {
+		t.Fatalf("failed to create midi.message.encode processor: %s", err)
+	}
+
+	if processorInstance.Type() != "midi.message.encode" {
+		t.Fatalf("midi.message.encode processor has wrong type: %s", processorInstance.Type())
+	}
+}