all: Refactor to nonglobal file systems

Updates #2701
Fixes #2951

hugolib/testhelpers_test.go

@@ -0,0 +1,53 @@
+package hugolib
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/spf13/hugo/deps"
+	"github.com/spf13/hugo/helpers"
+	"github.com/spf13/hugo/hugofs"
+	"github.com/spf13/hugo/source"
+	"github.com/spf13/hugo/tplapi"
+	"github.com/spf13/viper"
+
+	"github.com/stretchr/testify/require"
+)
+
+func newTestDepsConfig() deps.DepsCfg {
+	return deps.DepsCfg{Fs: hugofs.NewMem()}
+}
+
+func newTestPathSpec() *helpers.PathSpec {
+	return helpers.NewPathSpec(hugofs.NewMem(), viper.GetViper())
+}
+
+func createWithTemplateFromNameValues(additionalTemplates ...string) func(templ tplapi.Template) error {
+
+	return func(templ tplapi.Template) error {
+		for i := 0; i < len(additionalTemplates); i += 2 {
+			err := templ.AddTemplate(additionalTemplates[i], additionalTemplates[i+1])
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+}
+
+func buildSingleSite(t *testing.T, depsCfg deps.DepsCfg, buildCfg BuildCfg) *Site {
+	h, err := NewHugoSitesFromConfiguration(depsCfg)
+
+	require.NoError(t, err)
+	require.Len(t, h.Sites, 1)
+
+	require.NoError(t, h.Build(buildCfg))
+
+	return h.Sites[0]
+}
+
+func writeSourcesToSource(t *testing.T, base string, fs *hugofs.Fs, sources ...source.ByteSource) {
+	for _, src := range sources {
+		writeSource(t, fs, filepath.Join(base, src.Name), string(src.Content))
+	}
+}