all: Remove unused code

Using x/tools/cmd/deadcode

htesting/testdata_builder.go

@@ -1,59 +0,0 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package htesting
-
-import (
-	"path/filepath"
-	"testing"
-
-	"github.com/spf13/afero"
-)
-
-type testFile struct {
-	name    string
-	content string
-}
-
-type testdataBuilder struct {
-	t          testing.TB
-	fs         afero.Fs
-	workingDir string
-
-	files []testFile
-}
-
-func NewTestdataBuilder(fs afero.Fs, workingDir string, t testing.TB) *testdataBuilder {
-	workingDir = filepath.Clean(workingDir)
-	return &testdataBuilder{fs: fs, workingDir: workingDir, t: t}
-}
-
-func (b *testdataBuilder) Add(filename, content string) *testdataBuilder {
-	b.files = append(b.files, testFile{name: filename, content: content})
-	return b
-}
-
-func (b *testdataBuilder) Build() *testdataBuilder {
-	for _, f := range b.files {
-		if err := afero.WriteFile(b.fs, filepath.Join(b.workingDir, f.name), []byte(f.content), 0666); err != nil {
-			b.t.Fatalf("failed to add %q: %s", f.name, err)
-		}
-	}
-	return b
-}
-
-func (b testdataBuilder) WithWorkingDir(dir string) *testdataBuilder {
-	b.workingDir = filepath.Clean(dir)
-	b.files = make([]testFile, 0)
-	return &b
-}