add test for loading from registry for rest of processors

internal/processor/test/mqtt-message-create_test.go

@@ -0,0 +1,33 @@
+package processor_test
+
+import (
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"github.com/jwetzell/showbridge-go/internal/processor"
+)
+
+func TestMQTTMessageCreateFromRegistry(t *testing.T) {
+	registration, ok := processor.ProcessorRegistry["mqtt.message.create"]
+	if !ok {
+		t.Fatalf("mqtt.message.create processor not registered")
+	}
+
+	processorInstance, err := registration.New(config.ProcessorConfig{
+		Type: "mqtt.message.create",
+		Params: map[string]any{
+			"topic":    "test/topic",
+			"payload":  "Hello, World!",
+			"qos":      1.0,
+			"retained": true,
+		},
+	})
+
+	if err != nil {
+		t.Fatalf("failed to create mqtt.message.create processor: %s", err)
+	}
+
+	if processorInstance.Type() != "mqtt.message.create" {
+		t.Fatalf("mqtt.message.create processor has wrong type: %s", processorInstance.Type())
+	}
+}