add benchmark for a complete use-case (the metalreview example)

bench_example_test.go

@@ -0,0 +1,42 @@
+package goquery
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"testing"
+)
+
+func BenchmarkMetalReviewExample(b *testing.B) {
+	var n int
+	var buf bytes.Buffer
+
+	b.StopTimer()
+	doc := LoadDoc("metalreview.html")
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		doc.Root.Find(".slider-row:nth-child(1) .slider-item").Each(func(i int, s *Selection) {
+			var band, title string
+			var score float64
+			var e error
+
+			n++
+			// For each item found, get the band, title and score, and print it
+			band = s.Find("strong").Text()
+			title = s.Find("em").Text()
+			if score, e = strconv.ParseFloat(s.Find(".score").Text(), 64); e != nil {
+				// Not a valid float, ignore score
+				if n <= 4 {
+					buf.WriteString(fmt.Sprintf("Review %d: %s - %s.\n", i, band, title))
+				}
+			} else {
+				// Print all, including score
+				if n <= 4 {
+					buf.WriteString(fmt.Sprintf("Review %d: %s - %s (%2.1f).\n", i, band, title, score))
+				}
+			}
+		})
+	}
+	b.Log(buf.String())
+	b.Logf("MetalReviewExample=%d", n)
+}