github.com/iancoleman/strcase v0.3.0: ToScreamingSnake

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 github.com/iancoleman/strcase.ToScreamingSnake in pkg:golang/github.com/iancoleman/strcase@v0.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/iancoleman/strcase@v0.3.0
Demonstrate these symbols/APIs:
  - github.com/iancoleman/strcase.ToScreamingSnake

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:sha256:2dd31e692e7508a71b6d5e987b89ef41274266baf4a49b25e64a46cbb2264e26","contract":["strcase.ToScreamingSnake converts camelCase and PascalCase identifiers to uppercase underscore-separated words","strcase.ToScreamingSnake converts kebab-case and space-delimited text to screaming snake case","strcase.ToScreamingSnake preserves already screaming snake case strings and returns empty string for empty input","strcase.ToScreamingSnake correctly separates uppercase acronyms and embedded numbers into uppercase snake tokens"],"goal":"verify github.com/iancoleman/strcase.ToScreamingSnake in pkg:golang/github.com/iancoleman/strcase@v0.3.0","kind":"HOW","packages":["pkg:golang/github.com/iancoleman/strcase@v0.3.0"],"schemaVersion":1,"symbols":["github.com/iancoleman/strcase.ToScreamingSnake"]},"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/github.com/iancoleman/strcase@v0.3.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/iancoleman/strcase@v0.3.0","symbols":["github.com/iancoleman/strcase.ToScreamingSnake"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/iancoleman/strcase v0.3.0

github.com/iancoleman/strcase v0.3.0 h1:nTXanmYxhfFAMjZL34Ov6gkzEsSJZ5DbhxWjvSASxEI=
github.com/iancoleman/strcase v0.3.0/go.mod h1:iwCmte+B7n89clKwxIoIXy/HfoL7AsD47ZCWhYzw7ho=

package main

import (
	"fmt"

	"github.com/iancoleman/strcase"
)

func main() {
	input := "helloWorld"
	screaming := strcase.ToScreamingSnake(input)
	fmt.Printf("%s -> %s\n", input, screaming)
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/iancoleman/strcase.ToScreamingSnake in pkg:golang/github.com/iancoleman/strcase@v0.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/iancoleman/strcase@v0.3.0"
  ],
  "symbols": [
    "github.com/iancoleman/strcase.ToScreamingSnake"
  ]
}

package main

import (
	"fmt"
	"os"

	"github.com/iancoleman/strcase"
)

func main() {
	// Assertion 1: strcase.ToScreamingSnake converts camelCase and PascalCase identifiers to uppercase underscore-separated words
	{
		camel := strcase.ToScreamingSnake("camelCase")
		if camel != "CAMEL_CASE" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected %q, got %q\n", "CAMEL_CASE", camel)
			os.Exit(1)
		}
		pascal := strcase.ToScreamingSnake("PascalCase")
		if pascal != "PASCAL_CASE" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected %q, got %q\n", "PASCAL_CASE", pascal)
			os.Exit(1)
		}
	}

	// Assertion 2: strcase.ToScreamingSnake converts kebab-case and space-delimited text to screaming snake case
	{
		kebab := strcase.ToScreamingSnake("kebab-case-text")
		if kebab != "KEBAB_CASE_TEXT" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected %q, got %q\n", "KEBAB_CASE_TEXT", kebab)
			os.Exit(1)
		}
		spaced := strcase.ToScreamingSnake("hello world example")
		if spaced != "HELLO_WORLD_EXAMPLE" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected %q, got %q\n", "HELLO_WORLD_EXAMPLE", spaced)
			os.Exit(1)
		}
	}

	// Assertion 3: strcase.ToScreamingSnake preserves already screaming snake case strings and returns empty string for empty input
	{
		screaming := strcase.ToScreamingSnake("ALREADY_SCREAMING_SNAKE")
		if screaming != "ALREADY_SCREAMING_SNAKE" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected %q, got %q\n", "ALREADY_SCREAMING_SNAKE", screaming)
			os.Exit(1)
		}
		empty := strcase.ToScreamingSnake("")
		if empty != "" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected empty string, got %q\n", empty)
			os.Exit(1)
		}
	}

	// Assertion 4: strcase.ToScreamingSnake correctly separates uppercase acronyms and embedded numbers into uppercase snake tokens
	{
		acronym := strcase.ToScreamingSnake("HTTPRequest")
		if acronym != "HTTP_REQUEST" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: expected %q, got %q\n", "HTTP_REQUEST", acronym)
			os.Exit(1)
		}
		withNums := strcase.ToScreamingSnake("foo123Bar")
		if withNums != "FOO_123_BAR" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: expected %q, got %q\n", "FOO_123_BAR", withNums)
			os.Exit(1)
		}
	}

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