diff --git a/internal/processor/string-split_test.go b/internal/processor/string-split_test.go
index 58f26df..f76a9a8 100644
--- a/internal/processor/string-split_test.go
+++ b/internal/processor/string-split_test.go
@@ -4,9 +4,49 @@ import (
 	"slices"
 	"testing"
 
+	"github.com/jwetzell/showbridge-go/internal/config"
 	"github.com/jwetzell/showbridge-go/internal/processor"
 )
 
+func TestStringSplitFromRegistry(t *testing.T) {
+	registration, ok := processor.ProcessorRegistry["string.split"]
+	if !ok {
+		t.Fatalf("string.split processor not registered")
+	}
+
+	processorInstance, err := registration.New(config.ProcessorConfig{
+		Type: "string.split",
+		Params: map[string]any{
+			"separator": ",",
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to create string.split processor: %s", err)
+	}
+
+	if processorInstance.Type() != "string.split" {
+		t.Fatalf("string.split processor has wrong type: %s", processorInstance.Type())
+	}
+
+	payload := "part1,part2,part3"
+	expected := []string{"part1", "part2", "part3"}
+
+	got, err := processorInstance.Process(t.Context(), payload)
+	if err != nil {
+		t.Fatalf("string.split processing failed: %s", err)
+	}
+
+	gotStrings, ok := got.([]string)
+
+	if !ok {
+		t.Fatalf("string.split should return a slice of strings")
+	}
+
+	if !slices.Equal(gotStrings, expected) {
+		t.Fatalf("string.split got %+v, expected %+v", got, expected)
+	}
+}
+
 func TestGoodStringSplit(t *testing.T) {
 	tests := []struct {
 		processor processor.Processor
@@ -42,22 +82,51 @@ func TestGoodStringSplit(t *testing.T) {
 
 func TestBadStringSplit(t *testing.T) {
 	tests := []struct {
-		processor   processor.Processor
 		name        string
 		payload     any
+		params      map[string]any
 		errorString string
 	}{
 		{
-			processor:   &processor.StringSplit{Separator: ","},
-			name:        "hello",
+			name:        "non-string input",
 			payload:     []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f},
+			params:      map[string]any{"separator": ","},
 			errorString: "string.split only accepts a string",
 		},
+		{
+			name:        "missing separator param",
+			payload:     "part1,part2,part3",
+			params:      map[string]any{},
+			errorString: "string.split requires a separator",
+		},
+		{
+			name:        "non-string separator param",
+			payload:     "part1,part2,part3",
+			params:      map[string]any{"separator": 123},
+			errorString: "string.split separator must be a string",
+		},
 	}
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			got, err := test.processor.Process(t.Context(), test.payload)
+			registration, ok := processor.ProcessorRegistry["string.split"]
+			if !ok {
+				t.Fatalf("string.split processor not registered")
+			}
+
+			processorInstance, err := registration.New(config.ProcessorConfig{
+				Type:   "string.split",
+				Params: test.params,
+			})
+
+			if err != nil {
+				if test.errorString != err.Error() {
+					t.Fatalf("string.split got error '%s', expected '%s'", err.Error(), test.errorString)
+				}
+				return
+			}
+
+			got, err := processorInstance.Process(t.Context(), test.payload)
 
 			if err == nil {
 				t.Fatalf("string.split expected error but got none, payload: %s", got)