feat(sanitizer): TruncateHTML benchmarks

internal/reader/sanitizer/truncate_test.go

@@ -3,7 +3,11 @@
 
 package sanitizer
 
-import "testing"
+import (
+	"os"
+	"strconv"
+	"testing"
+)
 
 func TestTruncateHTML(t *testing.T) {
 	tests := []struct {
@@ -84,3 +88,45 @@ func TestTruncateHTML(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkTruncateHTML(b *testing.B) {
+	benches := []struct {
+		filename string
+		limit    int
+	}{
+		{
+			filename: "miniflux_github.html",
+			limit:    100,
+		},
+		{
+			filename: "miniflux_github.html",
+			limit:    10_000,
+		},
+		{
+			filename: "miniflux_wikipedia.html",
+			limit:    100,
+		},
+		{
+			filename: "miniflux_wikipedia.html",
+			limit:    100_000,
+		},
+	}
+
+	for _, f := range benches {
+		data, err := os.ReadFile("testdata/" + f.filename)
+		if err != nil {
+			b.Fatalf(`Unable to read file %q: %v`, f.filename, err)
+		}
+
+		b.Run(f.filename+"_"+strconv.Itoa(f.limit), func(b *testing.B) {
+			var junk string
+
+			str := string(data)
+			for b.Loop() {
+				junk = TruncateHTML(str, 100)
+			}
+
+			_ = junk
+		})
+	}
+}