main: move pomerium main code to an internal cmd package so that it can be called directly from tests (#734)

* main: move pomerium main code to an internal cmd package so that it can be called directly from tests

* fix test

cmd/pomerium/main.go

@@ -4,29 +4,10 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"net"
-	"os"
-	"os/signal"
-	"sync"
-	"syscall"
 
-	"github.com/pomerium/pomerium/authenticate"
-	"github.com/pomerium/pomerium/authorize"
-	"github.com/pomerium/pomerium/cache"
-	"github.com/pomerium/pomerium/config"
-	"github.com/pomerium/pomerium/internal/controlplane"
-	"github.com/pomerium/pomerium/internal/envoy"
-	pbCache "github.com/pomerium/pomerium/internal/grpc/cache"
-	"github.com/pomerium/pomerium/internal/httputil"
+	"github.com/pomerium/pomerium/internal/cmd/pomerium"
 	"github.com/pomerium/pomerium/internal/log"
-	"github.com/pomerium/pomerium/internal/telemetry/metrics"
-	"github.com/pomerium/pomerium/internal/telemetry/trace"
-	"github.com/pomerium/pomerium/internal/urlutil"
 	"github.com/pomerium/pomerium/internal/version"
-	"github.com/pomerium/pomerium/proxy"
-
-	envoy_service_auth_v2 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v2"
-	"golang.org/x/sync/errgroup"
 )
 
 var versionFlag = flag.Bool("version", false, "prints the version")
@@ -44,179 +25,5 @@ func run(ctx context.Context) error {
 		fmt.Println(version.FullVersion())
 		return nil
 	}
-	opt, err := config.NewOptionsFromConfig(*configFile)
-	if err != nil {
-		return err
-	}
-	var optionsUpdaters []config.OptionsUpdater
-
-	log.Info().Str("version", version.FullVersion()).Msg("cmd/pomerium")
-
-	if err := setupMetrics(opt); err != nil {
-		return err
-	}
-	if err := setupTracing(opt); err != nil {
-		return err
-	}
-
-	// setup the control plane
-	controlPlane, err := controlplane.NewServer()
-	if err != nil {
-		return fmt.Errorf("error creating control plane: %w", err)
-	}
-	optionsUpdaters = append(optionsUpdaters, controlPlane)
-	err = controlPlane.UpdateOptions(*opt)
-	if err != nil {
-		return fmt.Errorf("error updating control plane options: %w", err)
-	}
-
-	_, grpcPort, _ := net.SplitHostPort(controlPlane.GRPCListener.Addr().String())
-	_, httpPort, _ := net.SplitHostPort(controlPlane.HTTPListener.Addr().String())
-
-	// create envoy server
-	envoyServer, err := envoy.NewServer(grpcPort, httpPort)
-	if err != nil {
-		return fmt.Errorf("error creating envoy server")
-	}
-
-	// add services
-	if err := setupAuthenticate(opt, controlPlane); err != nil {
-		return err
-	}
-	if err := setupAuthorize(opt, controlPlane, &optionsUpdaters); err != nil {
-		return err
-	}
-	if err := setupCache(opt, controlPlane); err != nil {
-		return err
-	}
-	if err := setupProxy(opt, controlPlane); err != nil {
-		return err
-	}
-
-	// start the config change listener
-	go config.WatchChanges(*configFile, opt, optionsUpdaters)
-
-	ctx, cancel := context.WithCancel(ctx)
-	go func() {
-		ch := make(chan os.Signal, 2)
-		signal.Notify(ch, os.Interrupt)
-		signal.Notify(ch, syscall.SIGTERM)
-		<-ch
-		cancel()
-	}()
-
-	// run everything
-	eg, ctx := errgroup.WithContext(ctx)
-	eg.Go(func() error {
-		return controlPlane.Run(ctx)
-	})
-	eg.Go(func() error {
-		return envoyServer.Run(ctx)
-	})
-	return eg.Wait()
-}
-
-func setupAuthenticate(opt *config.Options, controlPlane *controlplane.Server) error {
-	if !config.IsAuthenticate(opt.Services) {
-		return nil
-	}
-
-	svc, err := authenticate.New(*opt)
-	if err != nil {
-		return fmt.Errorf("error creating authenticate service: %w", err)
-	}
-	host := urlutil.StripPort(opt.AuthenticateURL.Host)
-	sr := controlPlane.HTTPRouter.Host(host).Subrouter()
-	svc.Mount(sr)
-	log.Info().Str("host", host).Msg("enabled authenticate service")
-
-	return nil
-}
-
-func setupAuthorize(opt *config.Options, controlPlane *controlplane.Server, optionsUpdaters *[]config.OptionsUpdater) error {
-	if !config.IsAuthorize(opt.Services) {
-		return nil
-	}
-
-	svc, err := authorize.New(*opt)
-	if err != nil {
-		return fmt.Errorf("error creating authorize service: %w", err)
-	}
-	envoy_service_auth_v2.RegisterAuthorizationServer(controlPlane.GRPCServer, svc)
-
-	log.Info().Msg("enabled authorize service")
-
-	*optionsUpdaters = append(*optionsUpdaters, svc)
-	err = svc.UpdateOptions(*opt)
-	if err != nil {
-		return fmt.Errorf("error updating authorize options: %w", err)
-	}
-	return nil
-}
-
-func setupCache(opt *config.Options, controlPlane *controlplane.Server) error {
-	if !config.IsCache(opt.Services) {
-		return nil
-	}
-
-	svc, err := cache.New(*opt)
-	if err != nil {
-		return fmt.Errorf("error creating config service: %w", err)
-	}
-	defer svc.Close()
-	pbCache.RegisterCacheServer(controlPlane.GRPCServer, svc)
-	log.Info().Msg("enabled cache service")
-	return nil
-}
-
-func setupMetrics(opt *config.Options) error {
-	if opt.MetricsAddr != "" {
-		handler, err := metrics.PrometheusHandler()
-		if err != nil {
-			return err
-		}
-		metrics.SetBuildInfo(opt.Services)
-		metrics.RegisterInfoMetrics()
-		serverOpts := &httputil.ServerOptions{
-			Addr:     opt.MetricsAddr,
-			Insecure: true,
-			Service:  "metrics",
-		}
-		var wg sync.WaitGroup
-		_, err = httputil.NewServer(serverOpts, handler, &wg)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func setupProxy(opt *config.Options, controlPlane *controlplane.Server) error {
-	if !config.IsProxy(opt.Services) {
-		return nil
-	}
-
-	svc, err := proxy.New(*opt)
-	if err != nil {
-		return fmt.Errorf("error creating proxy service: %w", err)
-	}
-	controlPlane.HTTPRouter.PathPrefix("/").Handler(svc)
-	return nil
-}
-
-func setupTracing(opt *config.Options) error {
-	if opt.TracingProvider != "" {
-		tracingOpts := &trace.TracingOptions{
-			Provider:                opt.TracingProvider,
-			Service:                 opt.Services,
-			Debug:                   opt.TracingDebug,
-			JaegerAgentEndpoint:     opt.TracingJaegerAgentEndpoint,
-			JaegerCollectorEndpoint: opt.TracingJaegerCollectorEndpoint,
-			ZipkinEndpoint:          opt.ZipkinEndpoint,
-		}
-		if err := trace.RegisterTracing(tracingOpts); err != nil {
-			return err
-		}
-	}
-	return nil
+	return pomerium.Run(ctx, *configFile)
 }

internal/cmd/pomerium/pomerium.go

@@ -0,0 +1,225 @@
+// Package pomerium houses the main pomerium CLI command.
+//
+package pomerium
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+
+	envoy_service_auth_v2 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v2"
+	"golang.org/x/sync/errgroup"
+
+	"github.com/pomerium/pomerium/authenticate"
+	"github.com/pomerium/pomerium/authorize"
+	"github.com/pomerium/pomerium/cache"
+	"github.com/pomerium/pomerium/config"
+	"github.com/pomerium/pomerium/internal/controlplane"
+	"github.com/pomerium/pomerium/internal/envoy"
+	pbCache "github.com/pomerium/pomerium/internal/grpc/cache"
+	"github.com/pomerium/pomerium/internal/httputil"
+	"github.com/pomerium/pomerium/internal/log"
+	"github.com/pomerium/pomerium/internal/telemetry/metrics"
+	"github.com/pomerium/pomerium/internal/telemetry/trace"
+	"github.com/pomerium/pomerium/internal/urlutil"
+	"github.com/pomerium/pomerium/internal/version"
+	"github.com/pomerium/pomerium/proxy"
+)
+
+// Run runs the main pomerium application.
+func Run(ctx context.Context, configFile string) error {
+	opt, err := config.NewOptionsFromConfig(configFile)
+	if err != nil {
+		return err
+	}
+	var optionsUpdaters []config.OptionsUpdater
+
+	log.Info().Str("version", version.FullVersion()).Msg("cmd/pomerium")
+
+	if err := setupMetrics(ctx, opt); err != nil {
+		return err
+	}
+	if err := setupTracing(ctx, opt); err != nil {
+		return err
+	}
+
+	// setup the control plane
+	controlPlane, err := controlplane.NewServer()
+	if err != nil {
+		return fmt.Errorf("error creating control plane: %w", err)
+	}
+	optionsUpdaters = append(optionsUpdaters, controlPlane)
+	err = controlPlane.UpdateOptions(*opt)
+	if err != nil {
+		return fmt.Errorf("error updating control plane options: %w", err)
+	}
+
+	_, grpcPort, _ := net.SplitHostPort(controlPlane.GRPCListener.Addr().String())
+	_, httpPort, _ := net.SplitHostPort(controlPlane.HTTPListener.Addr().String())
+
+	// create envoy server
+	envoyServer, err := envoy.NewServer(grpcPort, httpPort)
+	if err != nil {
+		return fmt.Errorf("error creating envoy server")
+	}
+
+	// add services
+	if err := setupAuthenticate(opt, controlPlane); err != nil {
+		return err
+	}
+	if err := setupAuthorize(opt, controlPlane, &optionsUpdaters); err != nil {
+		return err
+	}
+	if err := setupCache(opt, controlPlane); err != nil {
+		return err
+	}
+	if err := setupProxy(opt, controlPlane); err != nil {
+		return err
+	}
+
+	// start the config change listener
+	go config.WatchChanges(configFile, opt, optionsUpdaters)
+
+	ctx, cancel := context.WithCancel(ctx)
+	go func() {
+		ch := make(chan os.Signal, 2)
+		defer signal.Stop(ch)
+
+		signal.Notify(ch, os.Interrupt)
+		signal.Notify(ch, syscall.SIGTERM)
+
+		select {
+		case <-ch:
+		case <-ctx.Done():
+		}
+		cancel()
+	}()
+
+	// run everything
+	eg, ctx := errgroup.WithContext(ctx)
+	eg.Go(func() error {
+		return controlPlane.Run(ctx)
+	})
+	eg.Go(func() error {
+		return envoyServer.Run(ctx)
+	})
+	return eg.Wait()
+}
+
+func setupAuthenticate(opt *config.Options, controlPlane *controlplane.Server) error {
+	if !config.IsAuthenticate(opt.Services) {
+		return nil
+	}
+
+	svc, err := authenticate.New(*opt)
+	if err != nil {
+		return fmt.Errorf("error creating authenticate service: %w", err)
+	}
+	host := urlutil.StripPort(opt.AuthenticateURL.Host)
+	sr := controlPlane.HTTPRouter.Host(host).Subrouter()
+	svc.Mount(sr)
+	log.Info().Str("host", host).Msg("enabled authenticate service")
+
+	return nil
+}
+
+func setupAuthorize(opt *config.Options, controlPlane *controlplane.Server, optionsUpdaters *[]config.OptionsUpdater) error {
+	if !config.IsAuthorize(opt.Services) {
+		return nil
+	}
+
+	svc, err := authorize.New(*opt)
+	if err != nil {
+		return fmt.Errorf("error creating authorize service: %w", err)
+	}
+	envoy_service_auth_v2.RegisterAuthorizationServer(controlPlane.GRPCServer, svc)
+
+	log.Info().Msg("enabled authorize service")
+
+	*optionsUpdaters = append(*optionsUpdaters, svc)
+	err = svc.UpdateOptions(*opt)
+	if err != nil {
+		return fmt.Errorf("error updating authorize options: %w", err)
+	}
+	return nil
+}
+
+func setupCache(opt *config.Options, controlPlane *controlplane.Server) error {
+	if !config.IsCache(opt.Services) {
+		return nil
+	}
+
+	svc, err := cache.New(*opt)
+	if err != nil {
+		return fmt.Errorf("error creating config service: %w", err)
+	}
+	defer svc.Close()
+	pbCache.RegisterCacheServer(controlPlane.GRPCServer, svc)
+	log.Info().Msg("enabled cache service")
+	return nil
+}
+
+func setupMetrics(ctx context.Context, opt *config.Options) error {
+	if opt.MetricsAddr != "" {
+		handler, err := metrics.PrometheusHandler()
+		if err != nil {
+			return err
+		}
+		metrics.SetBuildInfo(opt.Services)
+		metrics.RegisterInfoMetrics()
+		serverOpts := &httputil.ServerOptions{
+			Addr:     opt.MetricsAddr,
+			Insecure: true,
+			Service:  "metrics",
+		}
+		var wg sync.WaitGroup
+		srv, err := httputil.NewServer(serverOpts, handler, &wg)
+		if err != nil {
+			return err
+		}
+		go func() {
+			<-ctx.Done()
+			_ = srv.Close()
+		}()
+	}
+	return nil
+}
+
+func setupProxy(opt *config.Options, controlPlane *controlplane.Server) error {
+	if !config.IsProxy(opt.Services) {
+		return nil
+	}
+
+	svc, err := proxy.New(*opt)
+	if err != nil {
+		return fmt.Errorf("error creating proxy service: %w", err)
+	}
+	controlPlane.HTTPRouter.PathPrefix("/").Handler(svc)
+	return nil
+}
+
+func setupTracing(ctx context.Context, opt *config.Options) error {
+	if opt.TracingProvider != "" {
+		tracingOpts := &trace.TracingOptions{
+			Provider:                opt.TracingProvider,
+			Service:                 opt.Services,
+			Debug:                   opt.TracingDebug,
+			JaegerAgentEndpoint:     opt.TracingJaegerAgentEndpoint,
+			JaegerCollectorEndpoint: opt.TracingJaegerCollectorEndpoint,
+			ZipkinEndpoint:          opt.ZipkinEndpoint,
+		}
+		exporter, err := trace.RegisterTracing(tracingOpts)
+		if err != nil {
+			return err
+		}
+		go func() {
+			<-ctx.Done()
+			trace.UnregisterTracing(exporter)
+		}()
+	}
+	return nil
+}

internal/cmd/pomerium/pomerium_test.go

@@ -1,4 +1,4 @@
-package main
+package pomerium
 
 import (
 	"context"
@@ -23,7 +23,7 @@ func Test_setupTracing(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			setupTracing(tt.opt)
+			setupTracing(context.Background(), tt.opt)
 		})
 	}
 }
@@ -41,7 +41,7 @@ func Test_setupMetrics(t *testing.T) {
 			c := make(chan os.Signal, 1)
 			signal.Notify(c, syscall.SIGINT)
 			defer signal.Stop(c)
-			setupMetrics(tt.opt)
+			setupMetrics(context.Background(), tt.opt)
 			syscall.Kill(syscall.Getpid(), syscall.SIGINT)
 			waitSig(t, c, syscall.SIGINT)
 		})
@@ -64,13 +64,11 @@ func Test_run(t *testing.T) {
 	t.Parallel()
 	tests := []struct {
 		name           string
-		versionFlag    bool
 		configFileFlag string
 		wantErr        bool
 	}{
-		{"simply print version", true, "", false},
-		{"nil configuration", false, "", true},
-		{"bad proxy no authenticate url", false, `
+		{"nil configuration", "", true},
+		{"bad proxy no authenticate url", `
 		{
 			"address": ":9433",
 			"grpc_address": ":9444",
@@ -82,7 +80,7 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		{"bad authenticate no cookie secret", false, `
+		{"bad authenticate no cookie secret", `
 		{
 			"address": ":9433",
 			"grpc_address": ":9444",
@@ -93,7 +91,7 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		{"bad authorize service bad shared key", false, `
+		{"bad authorize service bad shared key", `
 		{
 			"address": ":9433",
 			"grpc_address": ":9444",
@@ -105,7 +103,7 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		{"bad http port", false, `
+		{"bad http port", `
 		{
 			"address": ":-1",
 			"grpc_address": ":9444",
@@ -119,7 +117,7 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		{"bad redirect port", false, `
+		{"bad redirect port", `
 		{
 			"address": ":9433",
 			"http_redirect_addr":":-1",
@@ -134,7 +132,7 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		{"bad metrics port ", false, `
+		{"bad metrics port ", `
 		{
 			"address": ":9433",
 			"metrics_address": ":-1",
@@ -148,7 +146,7 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		{"malformed tracing provider", false, `
+		{"malformed tracing provider", `
 		{
 			"tracing_provider": "bad tracing provider",
 			"address": ":9433",
@@ -163,55 +161,9 @@ func Test_run(t *testing.T) {
 			"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
 		  }
 		`, true},
-		// {"simple cache", false, `
-		// {
-		// 	"address": ":9433",
-		// 	"grpc_address": ":9444",
-		// 	"grpc_insecure": false,
-		// 	"insecure_server": true,
-		// 	"cache_service_url": "https://authorize.corp.example",
-		// 	"authenticate_service_url": "https://authenticate.corp.example",
-		// 	"shared_secret": "YixWi1MYh77NMECGGIJQevoonYtVF+ZPRkQZrrmeRqM=",
-		// 	"cookie_secret": "zixWi1MYh77NMECGGIJQevoonYtVF+ZPRkQZrrmeRqM=",
-		// 	"services": "cache",
-		// 	"cache_store": "bolt",
-		// 	"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
-		//   }
-		// `, false},
-		// {"malformed cache", false, `
-		// {
-		// 	"address": ":9433",
-		// 	"grpc_address": ":9444",
-		// 	"grpc_insecure": false,
-		// 	"insecure_server": true,
-		// 	"cache_service_url": "https://authorize.corp.example",
-		// 	"authenticate_service_url": "https://authenticate.corp.example",
-		// 	"shared_secret": "YixWi1MYh77NMECGGIJQevoonYtVF+ZPRkQZrrmeRqM=",
-		// 	"cookie_secret": "zixWi1MYh77NMECGGIJQevoonYtVF+ZPRkQZrrmeRqM=",
-		// 	"services": "cache",
-		// 	"cache_store": "bad bolt",
-		// 	"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
-		//   }
-		// `, true},
-		// {"bad cache port", false, `
-		// {
-		// 	"address": ":9433",
-		// 	"grpc_address": ":9999999",
-		// 	"grpc_insecure": false,
-		// 	"insecure_server": true,
-		// 	"cache_service_url": "https://authorize.corp.example",
-		// 	"authenticate_service_url": "https://authenticate.corp.example",
-		// 	"shared_secret": "YixWi1MYh77NMECGGIJQevoonYtVF+ZPRkQZrrmeRqM=",
-		// 	"cookie_secret": "zixWi1MYh77NMECGGIJQevoonYtVF+ZPRkQZrrmeRqM=",
-		// 	"services": "cache",
-		// 	"cache_store": "bolt",
-		// 	"policy": [{ "from": "https://pomerium.io", "to": "https://httpbin.org" }]
-		//   }
-		// `, true},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			versionFlag = &tt.versionFlag
 			tmpFile, err := ioutil.TempFile(os.TempDir(), "*.json")
 			if err != nil {
 				t.Fatal("Cannot create temporary file", err)
@@ -222,12 +174,12 @@ func Test_run(t *testing.T) {
 				tmpFile.Close()
 				t.Fatal(err)
 			}
-			configFile = &fn
+			configFile := fn
 
 			ctx, clearTimeout := context.WithTimeout(context.Background(), 500*time.Millisecond)
 			defer clearTimeout()
 
-			err = run(ctx)
+			err = Run(ctx, configFile)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("run() error = %v, wantErr %v", err, tt.wantErr)
 			}

internal/telemetry/trace/trace.go

@@ -44,28 +44,34 @@ type TracingOptions struct {
 }
 
 // RegisterTracing creates a new trace exporter from TracingOptions.
-func RegisterTracing(opts *TracingOptions) error {
+func RegisterTracing(opts *TracingOptions) (trace.Exporter, error) {
+	var exporter trace.Exporter
 	var err error
 	switch opts.Provider {
 	case JaegerTracingProviderName:
-		err = registerJaeger(opts)
+		exporter, err = registerJaeger(opts)
 	case ZipkinTracingProviderName:
-		err = registerZipkin(opts)
+		exporter, err = registerZipkin(opts)
 	default:
-		return fmt.Errorf("telemetry/trace: provider %s unknown", opts.Provider)
+		return nil, fmt.Errorf("telemetry/trace: provider %s unknown", opts.Provider)
 	}
 	if err != nil {
-		return err
+		return nil, err
 	}
 	if opts.Debug {
 		log.Debug().Msg("telemetry/trace: debug on, sample everything")
 		trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 	}
 	log.Debug().Interface("Opts", opts).Msg("telemetry/trace: exporter created")
-	return nil
+	return exporter, nil
 }
 
-func registerJaeger(opts *TracingOptions) error {
+// UnregisterTracing unregisters a trace exporter.
+func UnregisterTracing(exporter trace.Exporter) {
+	trace.UnregisterExporter(exporter)
+}
+
+func registerJaeger(opts *TracingOptions) (trace.Exporter, error) {
 	jex, err := jaeger.NewExporter(
 		jaeger.Options{
 			AgentEndpoint:     opts.JaegerAgentEndpoint,
@@ -73,16 +79,16 @@ func registerJaeger(opts *TracingOptions) error {
 			ServiceName:       opts.Service,
 		})
 	if err != nil {
-		return err
+		return nil, err
 	}
 	trace.RegisterExporter(jex)
-	return nil
+	return jex, nil
 }
 
-func registerZipkin(opts *TracingOptions) error {
+func registerZipkin(opts *TracingOptions) (trace.Exporter, error) {
 	localEndpoint, err := zipkin.NewEndpoint(opts.Service, "")
 	if err != nil {
-		return fmt.Errorf("telemetry/trace: could not create local endpoint: %w", err)
+		return nil, fmt.Errorf("telemetry/trace: could not create local endpoint: %w", err)
 	}
 
 	reporter := zipkinHTTP.NewReporter(opts.ZipkinEndpoint)
@@ -90,7 +96,7 @@ func registerZipkin(opts *TracingOptions) error {
 	exporter := ocZipkin.NewExporter(reporter, localEndpoint)
 	trace.RegisterExporter(exporter)
 
-	return nil
+	return exporter, nil
 }
 
 // StartSpan starts a new child span of the current span in the context. If

internal/telemetry/trace/trace_test.go

@@ -15,7 +15,7 @@ func TestRegisterTracing(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if err := RegisterTracing(tt.opts); (err != nil) != tt.wantErr {
+			if _, err := RegisterTracing(tt.opts); (err != nil) != tt.wantErr {
 				t.Errorf("RegisterTracing() error = %v, wantErr %v", err, tt.wantErr)
 			}
 		})