github.com/spf13/cast v1.10.0: ToBool, ToBoolE

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 pkg:golang/github.com/spf13/cast@v1.10.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/spf13/cast@v1.10.0
Demonstrate these symbols/APIs:
  - cast.ToBool
  - cast.ToBoolE

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.

package sample

import (
	"github.com/spf13/cast"
)

// ToBool converts an arbitrary value to a boolean using cast.ToBool.
// It returns false if conversion cannot be performed.
func ToBool(v any) bool {
	return cast.ToBool(v)
}

// ToBoolE converts an arbitrary value to a boolean using cast.ToBoolE,
// returning an error if conversion cannot be performed.
func ToBoolE(v any) (bool, error) {
	return cast.ToBoolE(v)
}

package sample

import (
	"testing"

	"github.com/spf13/cast"
)

func TestToBool_Booleans(t *testing.T) {
	if got := cast.ToBool(true); got != true {
		t.Fatalf("cast.ToBool(true) = %v; want true", got)
	}
	if got := cast.ToBool(false); got != false {
		t.Fatalf("cast.ToBool(false) = %v; want false", got)
	}
}

func TestToBool_Strings(t *testing.T) {
	truthy := []string{"true", "True", "TRUE", "t", "T", "1"}
	for _, s := range truthy {
		if got := cast.ToBool(s); got != true {
			t.Fatalf("cast.ToBool(%q) = %v; want true", s, got)
		}
		val, err := cast.ToBoolE(s)
		if err != nil || val != true {
			t.Fatalf("cast.ToBoolE(%q) = (%v, %v); want (true, nil)", s, val, err)
		}
	}

	falsy := []string{"false", "False", "FALSE", "f", "F", "0"}
	for _, s := range falsy {
		if got := cast.ToBool(s); got != false {
			t.Fatalf("cast.ToBool(%q) = %v; want false", s, got)
		}
		val, err := cast.ToBoolE(s)
		if err != nil || val != false {
			t.Fatalf("cast.ToBoolE(%q) = (%v, %v); want (false, nil)", s, val, err)
		}
	}
}

func TestToBool_NumericValues(t *testing.T) {
	if got := cast.ToBool(1); got != true {
		t.Fatalf("cast.ToBool(1) = %v; want true", got)
	}
	if got := cast.ToBool(0); got != false {
		t.Fatalf("cast.ToBool(0) = %v; want false", got)
	}
	if got := cast.ToBool(int8(1)); got != true {
		t.Fatalf("cast.ToBool(int8(1)) = %v; want true", got)
	}
	if got := cast.ToBool(int8(0)); got != false {
		t.Fatalf("cast.ToBool(int8(0)) = %v; want false", got)
	}
	if got := cast.ToBool(int16(1)); got != true {
		t.Fatalf("cast.ToBool(int16(1)) = %v; want true", got)
	}
	if got := cast.ToBool(int16(0)); got != false {
		t.Fatalf("cast.ToBool(int16(0)) = %v; want false", got)
	}
	if got := cast.ToBool(int32(1)); got != true {
		t.Fatalf("cast.ToBool(int32(1)) = %v; want true", got)
	}
	if got := cast.ToBool(int32(0)); got != false {
		t.Fatalf("cast.ToBool(int32(0)) = %v; want false", got)
	}
	if got := cast.ToBool(int64(1)); got != true {
		t.Fatalf("cast.ToBool(int64(1)) = %v; want true", got)
	}
	if got := cast.ToBool(int64(0)); got != false {
		t.Fatalf("cast.ToBool(int64(0)) = %v; want false", got)
	}
	if got := cast.ToBool(uint(1)); got != true {
		t.Fatalf("cast.ToBool(uint(1)) = %v; want true", got)
	}
	if got := cast.ToBool(uint(0)); got != false {
		t.Fatalf("cast.ToBool(uint(0)) = %v; want false", got)
	}
	if got := cast.ToBool(float32(1.0)); got != true {
		t.Fatalf("cast.ToBool(float32(1.0)) = %v; want true", got)
	}
	if got := cast.ToBool(float32(0.0)); got != false {
		t.Fatalf("cast.ToBool(float32(0.0)) = %v; want false", got)
	}
	if got := cast.ToBool(1.0); got != true {
		t.Fatalf("cast.ToBool(1.0) = %v; want true", got)
	}
	if got := cast.ToBool(0.0); got != false {
		t.Fatalf("cast.ToBool(0.0) = %v; want false", got)
	}
}

func TestToBool_Nil(t *testing.T) {
	if got := cast.ToBool(nil); got != false {
		t.Fatalf("cast.ToBool(nil) = %v; want false", got)
	}
	val, err := cast.ToBoolE(nil)
	if err != nil || val != false {
		t.Fatalf("cast.ToBoolE(nil) = (%v, %v); want (false, nil)", val, err)
	}
}

func TestToBool_Pointers(t *testing.T) {
	bTrue := true
	if got := cast.ToBool(&bTrue); got != true {
		t.Fatalf("cast.ToBool(&bTrue) = %v; want true", got)
	}
	bFalse := false
	if got := cast.ToBool(&bFalse); got != false {
		t.Fatalf("cast.ToBool(&bFalse) = %v; want false", got)
	}
	sTrue := "true"
	if got := cast.ToBool(&sTrue); got != true {
		t.Fatalf("cast.ToBool(&sTrue) = %v; want true", got)
	}
	sFalse := "0"
	if got := cast.ToBool(&sFalse); got != false {
		t.Fatalf("cast.ToBool(&sFalse) = %v; want false", got)
	}
	nOne := 1
	if got := cast.ToBool(&nOne); got != true {
		t.Fatalf("cast.ToBool(&nOne) = %v; want true", got)
	}
	nZero := 0
	if got := cast.ToBool(&nZero); got != false {
		t.Fatalf("cast.ToBool(&nZero) = %v; want false", got)
	}
}

func TestToBool_InvalidAndUnsupported(t *testing.T) {
	invalidCases := []any{
		"not_a_boolean",
		[]int{1, 2, 3},
		map[string]bool{"a": true},
		struct{}{},
	}
	for _, c := range invalidCases {
		if got := cast.ToBool(c); got != false {
			t.Fatalf("cast.ToBool(%v) = %v; want false", c, got)
		}
		if _, err := cast.ToBoolE(c); err == nil {
			t.Fatalf("cast.ToBoolE(%v) expected error, got nil", c)
		}
	}
}

func TestToBool_Helper(t *testing.T) {
	cases := []struct {
		input    any
		expected bool
	}{
		{"true", true},
		{"false", false},
		{1, true},
		{0, false},
		{nil, false},
	}
	for _, c := range cases {
		if got := ToBool(c.input); got != c.expected {
			t.Fatalf("ToBool(%v) = %v; want %v", c.input, got, c.expected)
		}
		val, err := ToBoolE(c.input)
		if err != nil || val != c.expected {
			t.Fatalf("ToBoolE(%v) = (%v, %v); want (%v, nil)", c.input, val, err, c.expected)
		}
	}
}

{"case":{"caseId":"case:sha256:99f25d337615aea7e278a885d075be124a63cf5c643fa20ee5bde16cbf314837","contract":["cast.ToBool preserves boolean values true and false","cast.ToBool and cast.ToBoolE parse truthy and falsy strings into boolean values","cast.ToBool converts numeric values 1 to true and 0 to false","cast.ToBool returns false and cast.ToBoolE returns false with nil error for nil values","cast.ToBool unwraps pointer values before converting their underlying values to bool","cast.ToBool returns false and cast.ToBoolE returns an error for unsupported types and invalid strings","ToBool converts the given value to a bool using cast.ToBool"],"goal":"verify pkg:golang/github.com/spf13/cast@v1.10.0","kind":"HOW","packages":["pkg:golang/github.com/spf13/cast@v1.10.0"],"schemaVersion":1,"symbols":["cast.ToBool","cast.ToBoolE"]},"contractCommand":["go","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@v1.10.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/spf13/cast@v1.10.0","symbols":["cast.ToBool","cast.ToBoolE"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require github.com/spf13/cast v1.10.0

github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
github.com/spf13/cast v1.10.0 h1:h2x0u2shc1QuLHfxi+cTJvs30+ZAHOGRic8uyGTDWxY=
github.com/spf13/cast v1.10.0/go.mod h1:jNfB8QC9IA6ZuY2ZjDp0KtFO2LZZlg4S/7bzP6qqeHo=

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/spf13/cast@v1.10.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/spf13/cast@v1.10.0"
  ],
  "symbols": [
    "cast.ToBool",
    "cast.ToBoolE"
  ]
}