From d0bdc44c303ae8fe16df4b704f23e137dd7b6fe3 Mon Sep 17 00:00:00 2001
From: Joel Wetzell <git@jwetzell.com>
Date: Sun, 8 Feb 2026 21:40:53 -0600
Subject: [PATCH] add test for string.filter

---
 internal/processor/string-filter_test.go | 171 +++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 internal/processor/string-filter_test.go

diff --git a/internal/processor/string-filter_test.go b/internal/processor/string-filter_test.go
new file mode 100644
index 0000000..74ca30e
--- /dev/null
+++ b/internal/processor/string-filter_test.go
@@ -0,0 +1,171 @@
+package processor_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"github.com/jwetzell/showbridge-go/internal/processor"
+)
+
+func TestStringFilterFromRegistry(t *testing.T) {
+	registration, ok := processor.ProcessorRegistry["string.filter"]
+	if !ok {
+		t.Fatalf("string.filter processor not registered")
+	}
+
+	processorInstance, err := registration.New(config.ProcessorConfig{
+		Type: "string.filter",
+		Params: map[string]any{
+			"pattern": "hello",
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to create string.filter processor: %s", err)
+	}
+
+	if processorInstance.Type() != "string.filter" {
+		t.Fatalf("string.filter processor has wrong type: %s", processorInstance.Type())
+	}
+
+	payload := "hello"
+	expected := "hello"
+
+	got, err := processorInstance.Process(t.Context(), payload)
+	if err != nil {
+		t.Fatalf("string.filter processing failed: %s", err)
+	}
+
+	gotString, ok := got.(string)
+
+	if !ok {
+		t.Fatalf("string.filter should return byte slice")
+	}
+
+	if gotString != expected {
+		t.Fatalf("string.filter got %+v, expected %+v", got, expected)
+	}
+}
+
+func TestGoodStringFilter(t *testing.T) {
+	tests := []struct {
+		name     string
+		params   map[string]any
+		payload  string
+		expected any
+	}{
+		{
+			name:     "matches pattern",
+			payload:  "hello",
+			params:   map[string]any{"pattern": "hello"},
+			expected: "hello",
+		},
+		{
+			name:     "does not match pattern",
+			payload:  "hello",
+			params:   map[string]any{"pattern": "world"},
+			expected: nil,
+		},
+		{
+			name:     "basic regex",
+			payload:  "hello world",
+			params:   map[string]any{"pattern": ".* world"},
+			expected: "hello world",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			registration, ok := processor.ProcessorRegistry["string.filter"]
+			if !ok {
+				t.Fatalf("string.filter processor not registered")
+			}
+
+			processorInstance, err := registration.New(config.ProcessorConfig{
+				Type:   "string.filter",
+				Params: test.params,
+			})
+
+			if err != nil {
+				t.Fatalf("string.filter failed to create processor: %s", err)
+			}
+
+			got, err := processorInstance.Process(t.Context(), test.payload)
+
+			if err != nil {
+				t.Fatalf("string.filter failed: %s", err)
+			}
+
+			if test.expected == nil {
+				if got != nil {
+					t.Fatalf("string.filter got %+v, expected nil", got)
+				}
+				return
+			}
+
+			gotString, ok := got.(string)
+			if !ok {
+				t.Fatalf("string.filter returned a %T payload: %s", got, got)
+			}
+
+			if !reflect.DeepEqual(gotString, test.expected) {
+				t.Fatalf("string.filter got %+v, expected %+v", gotString, test.expected)
+			}
+		})
+	}
+}
+
+func TestBadStringFilter(t *testing.T) {
+	tests := []struct {
+		name        string
+		payload     any
+		params      map[string]any
+		errorString string
+	}{
+		{
+			name:        "no pattern param",
+			payload:     "hello",
+			params:      map[string]any{},
+			errorString: "string.filter requires a pattern parameter",
+		},
+		{
+			name:    "non-string input",
+			payload: []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f},
+			params: map[string]any{
+				"pattern": "hello",
+			},
+			errorString: "string.filter processor only accepts a string",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			registration, ok := processor.ProcessorRegistry["string.filter"]
+			if !ok {
+				t.Fatalf("string.filter processor not registered")
+			}
+
+			processorInstance, err := registration.New(config.ProcessorConfig{
+				Type:   "string.filter",
+				Params: test.params,
+			})
+
+			if err != nil {
+				if test.errorString != err.Error() {
+					t.Fatalf("string.filter got error '%s', expected '%s'", err.Error(), test.errorString)
+				}
+				return
+			}
+
+			got, err := processorInstance.Process(t.Context(), test.payload)
+
+			if err == nil {
+				t.Fatalf("string.filter expected to fail but got payload: %s", got)
+			}
+
+			if err.Error() != test.errorString {
+				t.Fatalf("string.filter got error '%s', expected '%s'", err.Error(), test.errorString)
+			}
+		})
+	}
+}