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

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.ToSnake 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.ToSnake

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:sha256:6f3a72978c7824718cf5aabfd5eca9a30029dbe4cd182a11eef778bbb1397cdf","contract":["strcase.ToSnake converts camelCase and PascalCase strings to snake_case","strcase.ToSnake converts kebab-case and space-separated strings to snake_case","strcase.ToSnake preserves already snake_case strings","strcase.ToSnake returns an empty string when given an empty string"],"goal":"verify github.com/iancoleman/strcase.ToSnake 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.ToSnake"]},"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.ToSnake"],"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"
	result := strcase.ToSnake(input)
	fmt.Printf("ToSnake(%q) = %q\n", input, result)
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/iancoleman/strcase.ToSnake 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.ToSnake"
  ]
}

package main

import (
	"fmt"
	"os"

	"github.com/iancoleman/strcase"
)

func main() {
	// Assertion 1: strcase.ToSnake converts camelCase and PascalCase strings to snake_case
	{
		if got := strcase.ToSnake("camelCase"); got != "camel_case" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected camel_case, got %q\n", got)
			os.Exit(1)
		}
		if got := strcase.ToSnake("PascalCase"); got != "pascal_case" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected pascal_case, got %q\n", got)
			os.Exit(1)
		}
	}

	// Assertion 2: strcase.ToSnake converts kebab-case and space-separated strings to snake_case
	{
		if got := strcase.ToSnake("kebab-case-string"); got != "kebab_case_string" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected kebab_case_string, got %q\n", got)
			os.Exit(1)
		}
		if got := strcase.ToSnake("AnyKind of_string"); got != "any_kind_of_string" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected any_kind_of_string, got %q\n", got)
			os.Exit(1)
		}
	}

	// Assertion 3: strcase.ToSnake preserves already snake_case strings
	{
		if got := strcase.ToSnake("already_snake_case"); got != "already_snake_case" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected already_snake_case, got %q\n", got)
			os.Exit(1)
		}
	}

	// Assertion 4: strcase.ToSnake returns an empty string when given an empty string
	{
		if got := strcase.ToSnake(""); got != "" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: expected empty string, got %q\n", got)
			os.Exit(1)
		}
	}

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