github.com/stretchr/objx v0.5.3: New

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 objx.New in pkg:golang/github.com/stretchr/objx@v0.5.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/objx@v0.5.3
Demonstrate these symbols/APIs:
  - objx.New

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:c82f7d6d353a1be530be62f538b063671ac5a88b1ecd352da3e4faf959d3a6b2","contract":["objx.New(map[string]interface{}) wraps the map into a non-nil objx.Map and exposes nested values via Get","objx.New(MSIConvertable) invokes MSI() on the argument and returns a non-nil objx.Map with the converted entries","objx.New returns a nil objx.Map when given nil or a value that is neither map[string]interface{} nor objx.MSIConvertable"],"goal":"verify objx.New in pkg:golang/github.com/stretchr/objx@v0.5.3","kind":"HOW","packages":["pkg:golang/github.com/stretchr/objx@v0.5.3"],"schemaVersion":1,"symbols":["objx.New"]},"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/stretchr/objx@v0.5.3"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/objx@v0.5.3","symbols":["objx.New"],"verifierAdapter":"golang@1"}

module sample

go 1.21

require github.com/stretchr/objx v0.5.3

github.com/stretchr/objx v0.5.3 h1:jmXUvGomnU1o3W/V5h2VEradbpJDwGrzugQQvL0POH4=
github.com/stretchr/objx v0.5.3/go.mod h1:rDQraq+vQZU7Fde9LOZLr8Tax6zZvy4kuNKF+QYS+U0=

package main

import (
	"fmt"

	"github.com/stretchr/objx"
)

type customPayload struct {
	Key   string
	Count int
}

func (c customPayload) MSI() map[string]interface{} {
	return map[string]interface{}{
		"key":   c.Key,
		"count": c.Count,
	}
}

func BuildFromMap(raw map[string]interface{}) objx.Map {
	return objx.New(raw)
}

func BuildFromConvertable(c objx.MSIConvertable) objx.Map {
	return objx.New(c)
}

func main() {
	m := BuildFromMap(map[string]interface{}{"status": "ok"})
	fmt.Println(m.Get("status").Str())
}

{
  "schemaVersion": 1,
  "goal": "verify objx.New in pkg:golang/github.com/stretchr/objx@v0.5.3",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/objx@v0.5.3"
  ],
  "symbols": [
    "objx.New"
  ]
}

package main

import (
	"fmt"
	"os"

	"github.com/stretchr/objx"
)

type sampleConvertable struct {
	name  string
	value int
}

func (s sampleConvertable) MSI() map[string]interface{} {
	return map[string]interface{}{
		"name":  s.name,
		"value": s.value,
	}
}

func main() {
	// 1. objx.New with map[string]interface{} wraps the map into an objx.Map.
	raw := map[string]interface{}{
		"service": "auth",
		"port":    8080,
		"nested": map[string]interface{}{
			"enabled": true,
		},
	}
	m := objx.New(raw)
	if m == nil {
		fmt.Fprintln(os.Stderr, "expected non-nil objx.Map from map[string]interface{}")
		os.Exit(1)
	}
	if got := m.Get("service").Str(); got != "auth" {
		fmt.Fprintf(os.Stderr, "expected service=auth, got %q\n", got)
		os.Exit(1)
	}
	if got := m.Get("port").Int(); got != 8080 {
		fmt.Fprintf(os.Stderr, "expected port=8080, got %d\n", got)
		os.Exit(1)
	}
	if got := m.Get("nested.enabled").Bool(); !got {
		fmt.Fprintln(os.Stderr, "expected nested.enabled=true")
		os.Exit(1)
	}

	// 2. objx.New with an objx.MSIConvertable calls MSI() and returns the resulting objx.Map.
	conv := sampleConvertable{name: "worker", value: 42}
	mc := objx.New(conv)
	if mc == nil {
		fmt.Fprintln(os.Stderr, "expected non-nil objx.Map from MSIConvertable")
		os.Exit(1)
	}
	if got := mc.Get("name").Str(); got != "worker" {
		fmt.Fprintf(os.Stderr, "expected name=worker, got %q\n", got)
		os.Exit(1)
	}
	if got := mc.Get("value").Int(); got != 42 {
		fmt.Fprintf(os.Stderr, "expected value=42, got %d\n", got)
		os.Exit(1)
	}

	// 3. objx.New with an unsupported type (neither map[string]interface{} nor MSIConvertable) returns nil.
	if invalid := objx.New("not-a-map"); invalid != nil {
		fmt.Fprintf(os.Stderr, "expected nil objx.Map for unsupported string input, got %v\n", invalid)
		os.Exit(1)
	}
	if nilMap := objx.New(nil); nilMap != nil {
		fmt.Fprintf(os.Stderr, "expected nil objx.Map for nil input, got %v\n", nilMap)
		os.Exit(1)
	}
}