Add a writeStats stresstest

Updates gohugoio#7161

hugolib/site_test.go

@@ -14,11 +14,14 @@
 package hugolib
 
 import (
+	"encoding/json"
 	"fmt"
 	"path/filepath"
 	"strings"
 	"testing"
 
+	"github.com/gohugoio/hugo/publisher"
+
 	"github.com/spf13/viper"
 
 	"github.com/markbates/inflect"
@@ -1024,3 +1027,55 @@ Some text.
         }
 `)
 }
+
+func TestClassCollectorStress(t *testing.T) {
+	b := newTestSitesBuilder(t)
+	b.WithConfigFile("toml", `
+	
+disableKinds = ["home", "section", "taxonomy", "taxonomyTerm" ]
+
+[languages]
+[languages.en]
+[languages.nb]
+[languages.no]
+[languages.sv]
+
+
+[build]
+  writeStats = true
+
+`)
+
+	b.WithTemplates("_default/single.html", `
+<div class="c d e" id="el2">Foo</div>
+
+Some text.
+
+<div class="{{ .Title }}">
+ABC.
+</div>
+
+<div class="f"></div>
+`)
+
+	for _, lang := range []string{"en", "nb", "no", "sv"} {
+
+		for i := 100; i <= 999; i++ {
+			b.WithContent(fmt.Sprintf("p%d.%s.md", i, lang), fmt.Sprintf("---\ntitle: p%s%d\n---", lang, i))
+		}
+	}
+
+	b.Build(BuildCfg{})
+
+	content := b.FileContent("hugo_stats.json")
+
+	stats := &publisher.PublishStats{}
+	b.Assert(json.Unmarshal([]byte(content), stats), qt.IsNil)
+
+	els := stats.HTMLElements
+
+	b.Assert(els.Classes, qt.HasLen, 3604) // (4 * 900) + 4
+	b.Assert(els.Tags, qt.HasLen, 5)
+	b.Assert(els.IDs, qt.HasLen, 1)
+
+}