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: node_fuzz_test.go
    path of file: ./repos/go-zero/core/stringx
    
    the code of the file until where you have to start completion: package stringx

import (
	"fmt"
	"math/rand"
	"strings"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

func FuzzNodeFind(f *testing.F) {
	rand.NewSource(time.Now().UnixNano())

	f.Add(10)
	f.Fuzz(func(t *testing.T, keys int) {
		str := Randn(rand.Intn(100) + 50)
		keywords := make(map[string]struct{})
		for i := 0; i < keys; i++ {
			keyword := Randn(rand.Intn(10) + 5)
			if !strings.Contains(str, keyword) {
				keywords[keyword] = struct{}{}
			}
		}

		size := len(str)
		var scopes []scope
		var n node
		for i := 0; i < size%20; i++ {
			start := rand.Intn(s
    
func FuzzNodeFind(f *testing.F) {
	rand.NewSource(time.Now().UnixNano())

	f.Add(10)
	f.Fuzz(func(t *testing.T, keys int) {
		str := Randn(rand.Intn(100) + 50)
		keywords := make(map[string]struct{})
		for i := 0; i < keys; i++ {
			keyword := Randn(rand.Intn(10) + 5)
			if !strings.Contains(str, keyword) {
				keywords[keyword] = struct{}{}
			}
		}

		size := len(str)
		var scopes []scope
		var n node
		for i := 0; i < size%20; i++ {
			start := rand.Intn(size)
			stop := start + rand.Intn(20) + 1
			if stop > size {
				stop = size
			}
			if start == stop {
				continue
			}

			keyword := str[start:stop]
			if _, ok := keywords[keyword]; ok {
				continue
			}

			keywords[keyword] = struct{}{}
			var pos int
			for pos <= len(str)-len(keyword) {
				val := str[pos:]
				p := strings.Index(val, keyword)
				if p < 0 {
					break
				}

				scopes = append(scopes, scope{
					start: pos + p,
					stop:  pos + p + len(keyword),
				})
				pos += p + 1
			}
		}

		for keyword := range keywords {
			n.add(keyword)
		}
		n.build()

		var buf strings.Builder
		buf.WriteString("keywords:\n")
		for key := range keywords {
			fmt.Fprintf(&buf, "\t%q,\n", key)
		}
		buf.WriteString("scopes:\n")
		for _, scp := range scopes {
			fmt.Fprintf(&buf, "\t{%d, %d},\n", scp.start, scp.stop)
		}
		fmt.Fprintf(&buf, "text:\n\t%s\n", str)
		defer func() {
			if r := recover(); r != nil {
				t.Errorf(buf.String())
			}
		}()
		assert.ElementsMatchf(t, scopes, n.find([]rune(str)), buf.String())
	})
}