Rework the Destination filesystem to make --renderStaticToDisk work

See #9626

hugolib/page_test.go

@@ -23,7 +23,6 @@ import (
 	"time"
 
 	"github.com/gohugoio/hugo/htesting"
-
 	"github.com/gohugoio/hugo/markup/asciidocext"
 	"github.com/gohugoio/hugo/markup/rst"
 
@@ -35,7 +34,6 @@ import (
 
 	"github.com/gohugoio/hugo/resources/page"
 	"github.com/gohugoio/hugo/resources/resource"
-	"github.com/spf13/afero"
 	"github.com/spf13/jwalterweatherman"
 
 	qt "github.com/frankban/quicktest"
@@ -1031,14 +1029,14 @@ func TestPageWithLastmodFromGitInfo(t *testing.T) {
 	}
 	c := qt.New(t)
 
-	// We need to use the OS fs for this.
-	cfg := config.New()
-	fs := hugofs.NewFrom(hugofs.Os, cfg)
-	fs.Destination = &afero.MemMapFs{}
-
 	wd, err := os.Getwd()
 	c.Assert(err, qt.IsNil)
 
+	// We need to use the OS fs for this.
+	cfg := config.NewWithTestDefaults()
+	cfg.Set("workingDir", filepath.Join(wd, "testsite"))
+	fs := hugofs.NewFrom(hugofs.Os, cfg)
+
 	cfg.Set("frontmatter", map[string]any{
 		"lastmod": []string{":git", "lastmod"},
 	})
@@ -1060,8 +1058,6 @@ func TestPageWithLastmodFromGitInfo(t *testing.T) {
 	cfg.Set("languages", langConfig)
 	cfg.Set("enableGitInfo", true)
 
-	cfg.Set("workingDir", filepath.Join(wd, "testsite"))
-
 	b := newTestSitesBuilderFromDepsCfg(t, deps.DepsCfg{Fs: fs, Cfg: cfg}).WithNothingAdded()
 
 	b.Build(BuildCfg{SkipRender: true})
@@ -1314,7 +1310,7 @@ func TestChompBOM(t *testing.T) {
 
 func TestPageWithEmoji(t *testing.T) {
 	for _, enableEmoji := range []bool{true, false} {
-		v := config.New()
+		v := config.NewWithTestDefaults()
 		v.Set("enableEmoji", enableEmoji)
 
 		b := newTestSitesBuilder(t).WithViper(v)