diff --git a/internal/processor/string-split_test.go b/internal/processor/string-split_test.go
new file mode 100644
index 0000000..e77dc20
--- /dev/null
+++ b/internal/processor/string-split_test.go
@@ -0,0 +1,70 @@
+package processor_test
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/processor"
+)
+
+func TestGoodStringSplit(t *testing.T) {
+	tests := []struct {
+		processor processor.Processor
+		name      string
+		payload   any
+		expected  []string
+	}{
+		{
+			processor: &processor.StringSplit{Separator: ","},
+			name:      "comma separated",
+			payload:   "part1,part2,part3",
+			expected:  []string{"part1", "part2", "part3"},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got, err := test.processor.Process(t.Context(), test.payload)
+
+			gotStrings, ok := got.([]string)
+			if !ok {
+				t.Errorf("string.split returned a %T payload: %s", got, got)
+			}
+			if err != nil {
+				t.Errorf("string.split failed: %s", err)
+			}
+			if !slices.Equal(gotStrings, test.expected) {
+				t.Errorf("string.split got %s, expected %s", got, test.expected)
+			}
+		})
+	}
+}
+
+func TestBasStringSplit(t *testing.T) {
+	tests := []struct {
+		processor   processor.Processor
+		name        string
+		payload     any
+		errorString string
+	}{
+		{
+			processor:   &processor.StringSplit{Separator: ","},
+			name:        "hello",
+			payload:     []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f},
+			errorString: "string.split only accepts a string",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got, err := test.processor.Process(t.Context(), test.payload)
+
+			if err == nil {
+				t.Errorf("string.split expected error but got none, payload: %s", got)
+			}
+			if err.Error() != test.errorString {
+				t.Errorf("string.split got error '%s', expected '%s'", err.Error(), test.errorString)
+			}
+		})
+	}
+}