go.opentelemetry.io/otel/trace v1.24.0: NewEventConfig, WithStackTrace

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/go.opentelemetry.io/otel/trace@v1.24.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/trace@v1.24.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/trace.NewEventConfig
  - go.opentelemetry.io/otel/trace.WithStackTrace

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_test

import (
	"testing"
	"time"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
)

func TestNewEventConfig_DefaultTimestamp(t *testing.T) {
	before := time.Now()
	cfg := trace.NewEventConfig()
	after := time.Now()

	if cfg.Timestamp().IsZero() {
		t.Fatalf("expected non-zero timestamp when no WithTimestamp is provided")
	}
	if cfg.Timestamp().Before(before) || cfg.Timestamp().After(after) {
		t.Fatalf("expected timestamp between %v and %v, got %v", before, after, cfg.Timestamp())
	}
	if len(cfg.Attributes()) != 0 {
		t.Fatalf("expected 0 attributes, got %d", len(cfg.Attributes()))
	}
	if cfg.StackTrace() {
		t.Fatalf("expected StackTrace to be false by default")
	}
}

func TestNewEventConfig_WithTimestamp(t *testing.T) {
	t1 := time.Date(2025, 1, 1, 12, 0, 0, 0, time.UTC)
	t2 := time.Date(2025, 1, 2, 12, 0, 0, 0, time.UTC)

	cfg := trace.NewEventConfig(
		trace.WithTimestamp(t1),
		trace.WithTimestamp(t2),
	)

	if !cfg.Timestamp().Equal(t2) {
		t.Fatalf("expected last timestamp %v, got %v", t2, cfg.Timestamp())
	}
}

func TestNewEventConfig_WithAttributes(t *testing.T) {
	attr1 := attribute.String("key1", "val1")
	attr2 := attribute.Int("key2", 42)
	attr3 := attribute.String("key1", "val1_duplicate")

	cfg := trace.NewEventConfig(
		trace.WithAttributes(attr1, attr2),
		trace.WithAttributes(attr3),
	)

	attrs := cfg.Attributes()
	if len(attrs) != 3 {
		t.Fatalf("expected 3 attributes, got %d", len(attrs))
	}
	if attrs[0] != attr1 {
		t.Fatalf("expected attr0 %v, got %v", attr1, attrs[0])
	}
	if attrs[1] != attr2 {
		t.Fatalf("expected attr1 %v, got %v", attr2, attrs[1])
	}
	if attrs[2] != attr3 {
		t.Fatalf("expected attr2 %v, got %v", attr3, attrs[2])
	}
}

func TestNewEventConfig_WithStackTrace(t *testing.T) {
	cfg1 := trace.NewEventConfig(trace.WithStackTrace(true))
	if !cfg1.StackTrace() {
		t.Fatalf("expected StackTrace to be true")
	}

	cfg2 := trace.NewEventConfig(
		trace.WithStackTrace(true),
		trace.WithStackTrace(false),
	)
	if cfg2.StackTrace() {
		t.Fatalf("expected StackTrace to be false after second option")
	}
}

func TestNewEventConfig_Composition(t *testing.T) {
	fixedTime := time.Date(2025, 6, 15, 8, 30, 0, 0, time.UTC)
	attrA := attribute.String("service", "order")
	attrB := attribute.Bool("retry", true)

	cfg := trace.NewEventConfig(
		trace.WithAttributes(attrA),
		trace.WithTimestamp(fixedTime),
		trace.WithStackTrace(true),
		trace.WithAttributes(attrB),
	)

	if !cfg.Timestamp().Equal(fixedTime) {
		t.Fatalf("expected timestamp %v, got %v", fixedTime, cfg.Timestamp())
	}
	if !cfg.StackTrace() {
		t.Fatalf("expected StackTrace to be true")
	}
	attrs := cfg.Attributes()
	if len(attrs) != 2 {
		t.Fatalf("expected 2 attributes, got %d", len(attrs))
	}
	if attrs[0] != attrA || attrs[1] != attrB {
		t.Fatalf("expected attributes [%v, %v], got %v", attrA, attrB, attrs)
	}
}

{"case":{"caseId":"case:sha256:9910c5bf0b26f00b244f4ed2b960a270a5f66451ec554c068aadfe2634c7fb32","contract":["NewEventConfig sets call time timestamp when no WithTimestamp option is provided","WithTimestamp overrides default timestamp and successive WithTimestamp options overwrite earlier values with last-value-wins precedence","WithAttributes appends attribute key-values across multiple options preserving order and duplicates without deduplication","WithStackTrace sets stack trace flag on EventConfig and successive WithStackTrace options overwrite earlier values with last-value-wins precedence","NewEventConfig composes WithAttributes, WithTimestamp, and WithStackTrace into a unified EventConfig"],"goal":"verify pkg:golang/go.opentelemetry.io/otel/trace@v1.24.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.24.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/trace.NewEventConfig","go.opentelemetry.io/otel/trace.WithStackTrace"]},"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/go.opentelemetry.io/otel/trace@v1.24.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/trace@v1.24.0","symbols":["go.opentelemetry.io/otel/trace.NewEventConfig","go.opentelemetry.io/otel/trace.WithStackTrace"],"verifierAdapter":"golang@1"}

module sample

go 1.22

require (
	go.opentelemetry.io/otel v1.24.0
	go.opentelemetry.io/otel/trace v1.24.0
)

go.opentelemetry.io/otel v1.24.0 h1:0LAOdjNmQeSTzGBzduGe/rU4tZhMwL5rWgtp9Ku5Jfo=
go.opentelemetry.io/otel v1.24.0/go.mod h1:W7b9Ozg4nkF5tWI5zsXkaKKDjdVjpD4oAt9Qi/MArHo=
go.opentelemetry.io/otel/trace v1.24.0 h1:CsKnnL4dUAr/0llH9FKuc698G04IrpWV0MQA/Y1YELI=
go.opentelemetry.io/otel/trace v1.24.0/go.mod h1:HPc3Xr/cOApsBI154IU0OI0HJexz+aw5uPdbs3UCjNU=

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/otel/trace@v1.24.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/trace@v1.24.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/trace.NewEventConfig",
    "go.opentelemetry.io/otel/trace.WithStackTrace"
  ]
}