You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fuzz_test.go
    path of file: ./repos/gccrs/libgo/go/image/png
    
    the code of the file until where you have to start completion: // Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package png

import (
	"bytes"
	"image"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func FuzzDecode(f *testing.F) {
	testdata, err := os.ReadDir("../testdata")
	if err != nil {
		f.Fatalf("failed to read testdata directory: %s", err)
	}
	for _, de := range testdata {
		if de.IsDir() || !strings.HasSuffix(de.Name(), ".png") {
			continue
		}
		b, err := os.ReadFile(filepath.Join("../testdata", de.Name()))
		if err != nil {
			f.Fatalf("failed to read testdata: %s", err)
		}
		f.Add(b)
	}

	f.Fuzz(func(t *testing.T, b []byte) {
		cfg, _, err := image.DecodeConfig(bytes.NewReader(b))
		if err != nil {
			return
		}
		if cfg.Width*cfg.Height > 1e6 {
			return
		}
		img, typ, err := image.Decode(bytes.NewReader(b))
		if err != nil || typ != "png" {
			return
		}
		levels := []CompressionLevel{
			DefaultCompression,
			NoCompression,
			BestSpeed,
			BestCompression,
		}
		for _, l := range levels {
			var w bytes.Buffer
			e := &Encoder{CompressionLevel: l}
			err = e.Encode(&w, img)
			if err != nil {
				t.Fatalf("failed to encode valid image: %s", err)
			}
			img1, err := Dec
    
func FuzzDecode(f *testing.F) {
	testdata, err := os.ReadDir("../testdata")
	if err != nil {
		f.Fatalf("failed to read testdata directory: %s", err)
	}
	for _, de := range testdata {
		if de.IsDir() || !strings.HasSuffix(de.Name(), ".png") {
			continue
		}
		b, err := os.ReadFile(filepath.Join("../testdata", de.Name()))
		if err != nil {
			f.Fatalf("failed to read testdata: %s", err)
		}
		f.Add(b)
	}

	f.Fuzz(func(t *testing.T, b []byte) {
		cfg, _, err := image.DecodeConfig(bytes.NewReader(b))
		if err != nil {
			return
		}
		if cfg.Width*cfg.Height > 1e6 {
			return
		}
		img, typ, err := image.Decode(bytes.NewReader(b))
		if err != nil || typ != "png" {
			return
		}
		levels := []CompressionLevel{
			DefaultCompression,
			NoCompression,
			BestSpeed,
			BestCompression,
		}
		for _, l := range levels {
			var w bytes.Buffer
			e := &Encoder{CompressionLevel: l}
			err = e.Encode(&w, img)
			if err != nil {
				t.Fatalf("failed to encode valid image: %s", err)
			}
			img1, err := Decode(&w)
			if err != nil {
				t.Fatalf("failed to decode roundtripped image: %s", err)
			}
			got := img1.Bounds()
			want := img.Bounds()
			if !got.Eq(want) {
				t.Fatalf("roundtripped image bounds have changed, got: %s, want: %s", got, want)
			}
		}
	})
}