add example test

internal/processing/string-decode_test.go

@@ -0,0 +1,41 @@
+package processing_test
+
+import (
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/processing"
+)
+
+func TestGoodStringDecode(t *testing.T) {
+	stringDecoder := processing.StringDecode{}
+	tests := []struct {
+		processor processing.Processor
+		name      string
+		payload   any
+		expected  string
+	}{
+		{
+			processor: &stringDecoder,
+			name:      "hello",
+			payload:   []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f},
+			expected:  "hello",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got, err := test.processor.Process(t.Context(), test.payload)
+
+			gotString, ok := got.(string)
+			if !ok {
+				t.Errorf("string decode returned a %T payload: %s", got, got)
+			}
+			if err != nil {
+				t.Errorf("string decode failed: %s", err)
+			}
+			if gotString != test.expected {
+				t.Errorf("String decode got %s, expected %s", got, test.expected)
+			}
+		})
+	}
+}