golang.org/x/net v0.51.0: atom.Div

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/net/html/atom.Div in pkg:golang/golang.org/x/net@v0.51.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.51.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html/atom.Div

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:1cca13bbbd98e412931a96907742f9f4706b99643f8b33d0c03817ad878d60eb","contract":["atom.Div represents the HTML div element and is non-zero","atom.Div.String returns string \"div\"","atom.Lookup with byte slice \"div\" returns atom.Div","atom.String with byte slice \"div\" returns string \"div\"","atom.Lookup returns 0 for unrecognized tag names"],"goal":"verify golang.org/x/net/html/atom.Div in pkg:golang/golang.org/x/net@v0.51.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.51.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html/atom.Div"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/net@v0.51.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.51.0","symbols":["golang.org/x/net/html/atom.Div"],"verifierAdapter":"golang@1"}

module sample

go 1.25.0

require golang.org/x/net v0.51.0

golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=

package main

import (
	"fmt"

	"golang.org/x/net/html/atom"
)

// GetDivAtom returns the atom representation of the HTML div element.
func GetDivAtom() atom.Atom {
	return atom.Div
}

func main() {
	a := GetDivAtom()
	fmt.Printf("Atom: %s (value: %d)\n", a.String(), a)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.Div in pkg:golang/golang.org/x/net@v0.51.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.51.0"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.Div"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/net/html/atom"
)

func main() {
	// 1. atom.Div represents the HTML div element and is non-zero
	if atom.Div == 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected atom.Div to be non-zero\n")
		os.Exit(1)
	}

	// 2. atom.Div.String returns string "div"
	if s := atom.Div.String(); s != "div" {
		fmt.Fprintf(os.Stderr, "FAIL: expected atom.Div.String() == %q, got %q\n", "div", s)
		os.Exit(1)
	}

	// 3. atom.Lookup with byte slice "div" returns atom.Div
	if a := atom.Lookup([]byte("div")); a != atom.Div {
		fmt.Fprintf(os.Stderr, "FAIL: expected atom.Lookup([]byte(\"div\")) == atom.Div, got %v\n", a)
		os.Exit(1)
	}

	// 4. atom.String with byte slice "div" returns string "div"
	if s := atom.String([]byte("div")); s != "div" {
		fmt.Fprintf(os.Stderr, "FAIL: expected atom.String([]byte(\"div\")) == %q, got %q\n", "div", s)
		os.Exit(1)
	}

	// 5. atom.Lookup returns 0 for unrecognized tag names
	if a := atom.Lookup([]byte("unrecognized_html_tag_name")); a != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected atom.Lookup for unknown tag to return 0, got %v\n", a)
		os.Exit(1)
	}
	if a := atom.Lookup([]byte("DIV")); a != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected atom.Lookup for uppercase tag to return 0, got %v\n", a)
		os.Exit(1)
	}

	fmt.Println("PASS: all contract assertions passed")
}