github.com/spf13/cast v1.3.1: ToBool

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/spf13/cast.ToBool in pkg:golang/github.com/spf13/cast@v1.3.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/spf13/cast@v1.3.1
Demonstrate these symbols/APIs:
  - github.com/spf13/cast.ToBool

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:sha256:04046ce0690cfc092733513b30d209e029fca89484904d7ba5d233ff5ef8e365","contract":["cast.ToBool returns true for truthy bool, int, string, and pointer values","cast.ToBool returns false for falsy bool, int, string, and nil values","cast.ToBool returns false for unsupported types and unparseable strings"],"goal":"verify github.com/spf13/cast.ToBool in pkg:golang/github.com/spf13/cast@v1.3.1","kind":"HOW","packages":["pkg:golang/github.com/spf13/cast@v1.3.1"],"schemaVersion":1,"symbols":["github.com/spf13/cast.ToBool"]},"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/spf13/cast@v1.3.1"],"schemaVersion":1,"subject":"pkg:golang/github.com/spf13/cast@v1.3.1","symbols":["github.com/spf13/cast.ToBool"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/spf13/cast v1.3.1

github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/spf13/cast v1.3.1 h1:nFm6S0SMdyzrzcmThSipiEubIDy8WEXKNZ0UOgiRpng=
github.com/spf13/cast v1.3.1/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

package main

import (
	"fmt"

	"github.com/spf13/cast"
)

func main() {
	fmt.Printf("cast.ToBool(\"true\"): %v\n", cast.ToBool("true"))
	fmt.Printf("cast.ToBool(1): %v\n", cast.ToBool(1))
	fmt.Printf("cast.ToBool(\"false\"): %v\n", cast.ToBool("false"))
	fmt.Printf("cast.ToBool(0): %v\n", cast.ToBool(0))
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/spf13/cast.ToBool in pkg:golang/github.com/spf13/cast@v1.3.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/spf13/cast@v1.3.1"
  ],
  "symbols": [
    "github.com/spf13/cast.ToBool"
  ]
}

package main

import (
	"fmt"
	"os"

	"github.com/spf13/cast"
)

func main() {
	// Assertion 1: cast.ToBool returns true for truthy bool, int, string, and pointer values
	{
		boolTrue := true
		intOne := 1
		strTrue := "true"

		truthy := []interface{}{
			true,
			&boolTrue,
			1,
			-1,
			42,
			&intOne,
			"true",
			"TRUE",
			"True",
			"t",
			"T",
			"1",
			&strTrue,
		}
		for _, val := range truthy {
			if !cast.ToBool(val) {
				fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected true for %v (%T), got false\n", val, val)
				os.Exit(1)
			}
		}
	}

	// Assertion 2: cast.ToBool returns false for falsy bool, int, string, and nil values
	{
		boolFalse := false
		intZero := 0
		strFalse := "false"

		falsy := []interface{}{
			false,
			&boolFalse,
			0,
			&intZero,
			"false",
			"FALSE",
			"False",
			"f",
			"F",
			"0",
			&strFalse,
			nil,
		}
		for _, val := range falsy {
			if cast.ToBool(val) {
				fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected false for %v (%T), got true\n", val, val)
				os.Exit(1)
			}
		}
	}

	// Assertion 3: cast.ToBool returns false for unsupported types and unparseable strings
	{
		invalids := []interface{}{
			int8(1),
			uint(1),
			float64(1.0),
			"not a bool",
			"invalid",
			"",
			struct{}{},
			[]int{1, 2, 3},
		}
		for _, val := range invalids {
			if cast.ToBool(val) {
				fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected false for %v (%T), got true\n", val, val)
				os.Exit(1)
			}
		}
	}

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