github.com/stretchr/objx v0.5.2

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/stretchr/objx@v0.5.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/objx@v0.5.2
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

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:sha256:0f1a357b300bcf8aebe55a1613c57b36e2661e6ce7f02c85ae0528547eea0909","contract":["objx.New wraps a map[string]interface{} into an objx.Map and supports nested access with Get","objx.Map.Set updates nested values using dot-delimited selectors and reflects in the map","objx.Map.JSON serializes the data structure to a valid JSON string"],"goal":"verify pkg:golang/github.com/stretchr/objx@v0.5.2","kind":"HOW","packages":["pkg:golang/github.com/stretchr/objx@v0.5.2"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/stretchr/objx@v0.5.2"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/objx@v0.5.2","verifierAdapter":"golang@1"}

module sample

go 1.22

require github.com/stretchr/objx v0.5.2

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/stretchr/objx v0.5.2 h1:xuMeJ0Sdp5ZMRXx/aWO6RZxdr3beISkG5/G/aIRr3pY=
github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"fmt"

	"github.com/stretchr/objx"
)

func main() {
	m := objx.New(map[string]interface{}{
		"name": "sample-project",
		"config": map[string]interface{}{
			"enabled": true,
			"retries": 3,
		},
		"tags": []interface{}{"go", "objx"},
	})

	fmt.Printf("Name: %s\n", m.Get("name").Str())
	fmt.Printf("Config Enabled: %t\n", m.Get("config.enabled").Bool())
	fmt.Printf("First Tag: %s\n", m.Get("tags[0]").Str())

	m.Set("config.retries", 5)
	fmt.Printf("Updated Retries: %d\n", m.Get("config.retries").Int())

	jsonStr, err := m.JSON()
	if err != nil {
		fmt.Printf("JSON error: %v\n", err)
		return
	}
	fmt.Printf("JSON: %s\n", jsonStr)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/stretchr/objx@v0.5.2",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/objx@v0.5.2"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

package main

import (
	"encoding/json"
	"fmt"
	"os"

	"github.com/stretchr/objx"
)

func main() {
	// Assertion 1: objx.New wraps a map[string]interface{} into an objx.Map and supports nested access with Get
	{
		raw := map[string]interface{}{
			"service": map[string]interface{}{
				"port": 8080,
				"host": "localhost",
			},
			"items": []interface{}{"alpha", "beta"},
		}
		m := objx.New(raw)
		if m == nil {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: expected non-nil objx.Map\n")
			os.Exit(1)
		}
		if m.Get("service.port").Int() != 8080 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: service.port expected 8080, got %d\n", m.Get("service.port").Int())
			os.Exit(1)
		}
		if m.Get("service.host").Str() != "localhost" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: service.host expected localhost, got %s\n", m.Get("service.host").Str())
			os.Exit(1)
		}
		if m.Get("items[1]").Str() != "beta" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: items[1] expected beta, got %s\n", m.Get("items[1]").Str())
			os.Exit(1)
		}
	}

	// Assertion 2: objx.Map.Set updates nested values using dot-delimited selectors and reflects in the map
	{
		m := objx.New(map[string]interface{}{
			"database": map[string]interface{}{
				"pool": 10,
			},
		})
		m.Set("database.pool", 20)
		if m.Get("database.pool").Int() != 20 {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: database.pool expected 20 after Set, got %d\n", m.Get("database.pool").Int())
			os.Exit(1)
		}
		m.Set("database.timeout", "30s")
		if m.Get("database.timeout").Str() != "30s" {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: database.timeout expected 30s after Set, got %s\n", m.Get("database.timeout").Str())
			os.Exit(1)
		}
	}

	// Assertion 3: objx.Map.JSON serializes the data structure to a valid JSON string
	{
		m := objx.New(map[string]interface{}{
			"status": "ok",
			"code":   200,
		})
		out, err := m.JSON()
		if err != nil {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: JSON serialization returned error: %v\n", err)
			os.Exit(1)
		}
		var parsed map[string]interface{}
		if err := json.Unmarshal([]byte(out), &parsed); err != nil {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: unmarshaling output failed: %v\n", err)
			os.Exit(1)
		}
		if parsed["status"] != "ok" || parsed["code"] != float64(200) {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: JSON content mismatch\n")
			os.Exit(1)
		}
	}

	fmt.Println("All contract assertions passed successfully.")
}