go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.43.0: WithDialOption

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 WithDialOption in pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0
Demonstrate these symbols/APIs:
  - WithDialOption

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:a20471405e3648f8264229b0edaee6af587be8eb734597376fc375a7dedd54d4","contract":["otlptracegrpc.WithDialOption configures gRPC dial options for OTLP trace exporter","otlptracegrpc.WithDialOption accepts multiple grpc.DialOption arguments","otlptracegrpc.WithDialOption connects to gRPC collector and exports spans","Exporter and TracerProvider shut down cleanly"],"goal":"verify WithDialOption in pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0"],"schemaVersion":1,"symbols":["WithDialOption"]},"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/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0","symbols":["WithDialOption"],"verifierAdapter":"golang@1"}

package sample

import (
	"context"
	"fmt"
	"time"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
	"go.opentelemetry.io/otel/sdk/resource"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
	"go.opentelemetry.io/otel/trace"
	"google.golang.org/grpc"
)

// ExporterConfig holds configuration options for the OTLP trace exporter.
type ExporterConfig struct {
	Endpoint    string
	Insecure    bool
	Timeout     time.Duration
	DialOptions []grpc.DialOption
}

// NewExporter creates an OTLP trace gRPC exporter applying otlptracegrpc.WithDialOption.
func NewExporter(ctx context.Context, cfg ExporterConfig) (*otlptrace.Exporter, error) {
	opts := make([]otlptracegrpc.Option, 0, 4)

	if cfg.Endpoint != "" {
		opts = append(opts, otlptracegrpc.WithEndpoint(cfg.Endpoint))
	}
	if cfg.Insecure {
		opts = append(opts, otlptracegrpc.WithInsecure())
	}
	if cfg.Timeout > 0 {
		opts = append(opts, otlptracegrpc.WithTimeout(cfg.Timeout))
	}
	if len(cfg.DialOptions) > 0 {
		opts = append(opts, otlptracegrpc.WithDialOption(cfg.DialOptions...))
	}

	exp, err := otlptracegrpc.New(ctx, opts...)
	if err != nil {
		return nil, fmt.Errorf("otlptracegrpc.New failed: %w", err)
	}
	return exp, nil
}

// NewTracerProvider creates a TracerProvider wired to the given trace exporter.
func NewTracerProvider(ctx context.Context, exp sdktrace.SpanExporter, serviceName string) (*sdktrace.TracerProvider, error) {
	res, err := resource.New(ctx,
		resource.WithAttributes(
			semconv.ServiceNameKey.String(serviceName),
			attribute.String("environment", "contract-test"),
		),
	)
	if err != nil {
		return nil, fmt.Errorf("resource.New failed: %w", err)
	}

	tp := sdktrace.NewTracerProvider(
		sdktrace.WithSyncer(exp),
		sdktrace.WithResource(res),
	)
	return tp, nil
}

// EmitSpan creates and ends a test span with given attributes.
func EmitSpan(ctx context.Context, tp *sdktrace.TracerProvider, tracerName, spanName string, attrs ...attribute.KeyValue) (context.Context, trace.Span) {
	tr := tp.Tracer(tracerName)
	ctx, span := tr.Start(ctx, spanName, trace.WithAttributes(attrs...))
	span.End()
	return ctx, span
}

module example.com/otlptracegrpc-dialopt-sample

go 1.25.0

require (
	go.opentelemetry.io/otel v1.43.0
	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.43.0
	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.43.0
	go.opentelemetry.io/otel/sdk v1.43.0
	go.opentelemetry.io/otel/trace v1.43.0
	go.opentelemetry.io/proto/otlp v1.10.0
	google.golang.org/grpc v1.80.0
)

require (
	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	github.com/go-logr/logr v1.4.3 // indirect
	github.com/go-logr/stdr v1.2.2 // indirect
	github.com/google/uuid v1.6.0 // indirect
	github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	go.opentelemetry.io/otel/metric v1.43.0 // indirect
	golang.org/x/net v0.52.0 // indirect
	golang.org/x/sys v0.42.0 // indirect
	golang.org/x/text v0.35.0 // indirect
	google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 // indirect
	google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9 // indirect
	google.golang.org/protobuf v1.36.11 // indirect
)

github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 h1:HWRh5R2+9EifMyIHV7ZV+MIZqgz+PMpZ14Jynv3O2Zs=
github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0/go.mod h1:JfhWUomR1baixubs02l85lZYYOm7LV6om4ceouMv45c=
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/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
go.opentelemetry.io/otel v1.43.0 h1:mYIM03dnh5zfN7HautFE4ieIig9amkNANT+xcVxAj9I=
go.opentelemetry.io/otel v1.43.0/go.mod h1:JuG+u74mvjvcm8vj8pI5XiHy1zDeoCS2LB1spIq7Ay0=
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.43.0 h1:88Y4s2C8oTui1LGM6bTWkw0ICGcOLCAI5l6zsD1j20k=
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.43.0/go.mod h1:Vl1/iaggsuRlrHf/hfPJPvVag77kKyvrLeD10kpMl+A=
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.43.0 h1:RAE+JPfvEmvy+0LzyUA25/SGawPwIUbZ6u0Wug54sLc=
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.43.0/go.mod h1:AGmbycVGEsRx9mXMZ75CsOyhSP6MFIcj/6dnG+vhVjk=
go.opentelemetry.io/otel/metric v1.43.0 h1:d7638QeInOnuwOONPp4JAOGfbCEpYb+K6DVWvdxGzgM=
go.opentelemetry.io/otel/metric v1.43.0/go.mod h1:RDnPtIxvqlgO8GRW18W6Z/4P462ldprJtfxHxyKd2PY=
go.opentelemetry.io/otel/sdk v1.43.0 h1:pi5mE86i5rTeLXqoF/hhiBtUNcrAGHLKQdhg4h4V9Dg=
go.opentelemetry.io/otel/sdk v1.43.0/go.mod h1:P+IkVU3iWukmiit/Yf9AWvpyRDlUeBaRg6Y+C58QHzg=
go.opentelemetry.io/otel/sdk/metric v1.43.0 h1:S88dyqXjJkuBNLeMcVPRFXpRw2fuwdvfCGLEo89fDkw=
go.opentelemetry.io/otel/sdk/metric v1.43.0/go.mod h1:C/RJtwSEJ5hzTiUz5pXF1kILHStzb9zFlIEe85bhj6A=
go.opentelemetry.io/otel/trace v1.43.0 h1:BkNrHpup+4k4w+ZZ86CZoHHEkohws8AY+WTX09nk+3A=
go.opentelemetry.io/otel/trace v1.43.0/go.mod h1:/QJhyVBUUswCphDVxq+8mld+AvhXZLhe+8WVFxiFff0=
go.opentelemetry.io/proto/otlp v1.10.0 h1:IQRWgT5srOCYfiWnpqUYz9CVmbO8bFmKcwYxpuCSL2g=
go.opentelemetry.io/proto/otlp v1.10.0/go.mod h1:/CV4QoCR/S9yaPj8utp3lvQPoqMtxXdzn7ozvvozVqk=
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
golang.org/x/net v0.52.0 h1:He/TN1l0e4mmR3QqHMT2Xab3Aj3L9qjbhRm78/6jrW0=
golang.org/x/net v0.52.0/go.mod h1:R1MAz7uMZxVMualyPXb+VaqGSa3LIaUqk0eEt3w36Sw=
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 h1:VPWxll4HlMw1Vs/qXtN7BvhZqsS9cdAittCNvVENElA=
google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9/go.mod h1:7QBABkRtR8z+TEnmXTqIqwJLlzrZKVfAUm7tY3yGv0M=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9 h1:m8qni9SQFH0tJc1X0vmnpw/0t+AImlSvp30sEupozUg=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
google.golang.org/grpc v1.80.0 h1:Xr6m2WmWZLETvUNvIUmeD5OAagMw3FiKmMlTdViWsHM=
google.golang.org/grpc v1.80.0/go.mod h1:ho/dLnxwi3EDJA4Zghp7k2Ec1+c2jqup0bFkw07bwF4=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

{
  "schemaVersion": 1,
  "goal": "verify WithDialOption in pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc@v1.43.0"
  ],
  "symbols": [
    "WithDialOption"
  ]
}

package main

import (
	"context"
	"fmt"
	"net"
	"os"
	"sync"
	"time"

	sample "example.com/otlptracegrpc-dialopt-sample"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
	coltracepb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
	tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

type mockTraceServer struct {
	coltracepb.UnimplementedTraceServiceServer
	mu       sync.Mutex
	requests []*coltracepb.ExportTraceServiceRequest
}

func (s *mockTraceServer) Export(ctx context.Context, req *coltracepb.ExportTraceServiceRequest) (*coltracepb.ExportTraceServiceResponse, error) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.requests = append(s.requests, req)
	return &coltracepb.ExportTraceServiceResponse{}, nil
}

func (s *mockTraceServer) getRequests() []*coltracepb.ExportTraceServiceRequest {
	s.mu.Lock()
	defer s.mu.Unlock()
	copied := make([]*coltracepb.ExportTraceServiceRequest, len(s.requests))
	copy(copied, s.requests)
	return copied
}

func main() {
	ctx := context.Background()

	// Assertion 1: otlptracegrpc.WithDialOption configures gRPC dial options for OTLP trace exporter
	opt1 := otlptracegrpc.WithDialOption(grpc.WithUserAgent("test-trace-agent"))
	if opt1 == nil {
		fmt.Fprintf(os.Stderr, "FAIL: WithDialOption returned nil option\n")
		os.Exit(1)
	}

	exp1, err := sample.NewExporter(ctx, sample.ExporterConfig{
		Endpoint: "127.0.0.1:4317",
		Insecure: true,
		DialOptions: []grpc.DialOption{
			grpc.WithUserAgent("custom-otel-client/1.0"),
		},
	})
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: NewExporter with WithDialOption failed: %v\n", err)
		os.Exit(1)
	}
	if exp1 == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil exporter\n")
		os.Exit(1)
	}
	_ = exp1.Shutdown(ctx)

	// Assertion 2: otlptracegrpc.WithDialOption accepts multiple grpc.DialOption arguments
	exp2, err := sample.NewExporter(ctx, sample.ExporterConfig{
		Endpoint: "127.0.0.1:4317",
		Insecure: true,
		DialOptions: []grpc.DialOption{
			grpc.WithUserAgent("multi-dial-opt"),
			grpc.WithAuthority("test.example.com"),
			grpc.WithTransportCredentials(insecure.NewCredentials()),
		},
	})
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: NewExporter with multiple DialOptions failed: %v\n", err)
		os.Exit(1)
	}
	if exp2 == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil exporter\n")
		os.Exit(1)
	}
	_ = exp2.Shutdown(ctx)

	// Start local mock gRPC collector server for offline verification
	lis, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: net.Listen failed: %v\n", err)
		os.Exit(1)
	}
	defer lis.Close()

	srv := grpc.NewServer()
	mockServer := &mockTraceServer{}
	coltracepb.RegisterTraceServiceServer(srv, mockServer)

	go func() {
		_ = srv.Serve(lis)
	}()
	defer srv.Stop()

	// Assertion 3: otlptracegrpc.WithDialOption connects to gRPC collector and exports spans
	exp3, err := sample.NewExporter(ctx, sample.ExporterConfig{
		Endpoint: lis.Addr().String(),
		Insecure: true,
		Timeout:  5 * time.Second,
		DialOptions: []grpc.DialOption{
			grpc.WithUserAgent("dialopt-exporter-test"),
		},
	})
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: NewExporter for server failed: %v\n", err)
		os.Exit(1)
	}

	tp, err := sample.NewTracerProvider(ctx, exp3, "contract-dialopt-service")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: NewTracerProvider failed: %v\n", err)
		os.Exit(1)
	}

	spanName := "dialopt-operation"
	_, span := sample.EmitSpan(ctx, tp, "contract-tracer", spanName,
		attribute.String("test.key", "test.val"),
		attribute.Int("test.num", 100),
	)
	spanCtx := span.SpanContext()
	wantTraceID := spanCtx.TraceID()
	wantSpanID := spanCtx.SpanID()

	if err := tp.ForceFlush(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: ForceFlush failed: %v\n", err)
		os.Exit(1)
	}

	reqs := mockServer.getRequests()
	if len(reqs) == 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected at least 1 gRPC export request, got 0\n")
		os.Exit(1)
	}

	var foundSpan *tracepb.Span
	for _, req := range reqs {
		for _, rs := range req.GetResourceSpans() {
			for _, ss := range rs.GetScopeSpans() {
				for _, s := range ss.GetSpans() {
					if s.GetName() == spanName {
						foundSpan = s
						break
					}
				}
			}
		}
	}
	if foundSpan == nil {
		fmt.Fprintf(os.Stderr, "FAIL: span %q not found in exported requests\n", spanName)
		os.Exit(1)
	}
	if [16]byte(foundSpan.GetTraceId()) != wantTraceID {
		fmt.Fprintf(os.Stderr, "FAIL: trace ID mismatch: got %x, want %x\n", foundSpan.GetTraceId(), wantTraceID)
		os.Exit(1)
	}
	if [8]byte(foundSpan.GetSpanId()) != wantSpanID {
		fmt.Fprintf(os.Stderr, "FAIL: span ID mismatch: got %x, want %x\n", foundSpan.GetSpanId(), wantSpanID)
		os.Exit(1)
	}

	// Check span attributes
	attrMap := make(map[string]any)
	for _, kv := range foundSpan.GetAttributes() {
		if kv.GetValue().GetStringValue() != "" {
			attrMap[kv.GetKey()] = kv.GetValue().GetStringValue()
		} else if kv.GetValue().GetIntValue() != 0 {
			attrMap[kv.GetKey()] = kv.GetValue().GetIntValue()
		}
	}
	if attrMap["test.key"] != "test.val" {
		fmt.Fprintf(os.Stderr, "FAIL: attribute test.key mismatch: got %v, want test.val\n", attrMap["test.key"])
		os.Exit(1)
	}
	if attrMap["test.num"] != int64(100) {
		fmt.Fprintf(os.Stderr, "FAIL: attribute test.num mismatch: got %v, want 100\n", attrMap["test.num"])
		os.Exit(1)
	}

	// Assertion 4: Exporter and TracerProvider shut down cleanly
	if err := tp.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: TracerProvider shutdown failed: %v\n", err)
		os.Exit(1)
	}
	if err := exp3.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: Exporter shutdown failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS: otlptracegrpc.WithDialOption contract passed")
}