diff --git a/api/router/router_test.go b/api/router/router_test.go
index 2b51f8c..9d52abb 100644
--- a/api/router/router_test.go
+++ b/api/router/router_test.go
@@ -89,7 +89,9 @@ func initial(t *testing.T) (server.Server, client.Client) {
 	)
 
 	h := &testServer{}
-	gpb.RegisterTestServer(s, h)
+	if err := gpb.RegisterTestServer(s, h); err != nil {
+		t.Fatal(err)
+	}
 
 	if err := s.Init(); err != nil {
 		t.Fatalf("failed to init: %v", err)
@@ -118,7 +120,9 @@ func check(t *testing.T, addr string, path string, expected string, timeout bool
 	if err != nil {
 		t.Fatalf("Failed to created http.Request: %v", err)
 	}
-	defer rsp.Body.Close()
+	defer func() {
+		_ = rsp.Body.Close()
+	}()
 
 	buf, err := ioutil.ReadAll(rsp.Body)
 	if err != nil {
@@ -140,7 +144,9 @@ func check(t *testing.T, addr string, path string, expected string, timeout bool
 
 func TestApiTimeout(t *testing.T) {
 	s, c := initial(t)
-	defer s.Stop()
+	defer func() {
+		_ = s.Stop()
+	}()
 
 	router := rregister.NewRouter(
 		router.WithHandler(rpc.Handler),
@@ -167,14 +173,19 @@ func TestApiTimeout(t *testing.T) {
 		log.Println(hsrv.ListenAndServe())
 	}()
 
-	defer hsrv.Close()
+	defer func() {
+		_ = hsrv.Close()
+	}()
+
 	time.Sleep(1 * time.Second)
 	check(t, hsrv.Addr, "http://%s/api/v0/test/call/TEST", `{"Id":"go.micro.client","Code":408,"Detail":"context deadline exceeded","Status":"Request Timeout"}`, true)
 }
 
 func TestRouterRegisterPcre(t *testing.T) {
 	s, c := initial(t)
-	defer s.Stop()
+	defer func() {
+		_ = s.Stop()
+	}()
 
 	router := rregister.NewRouter(
 		router.WithHandler(rpc.Handler),
@@ -208,7 +219,9 @@ func TestRouterRegisterPcre(t *testing.T) {
 
 func TestRouterStaticPcre(t *testing.T) {
 	s, c := initial(t)
-	defer s.Stop()
+	defer func() {
+		_ = s.Stop()
+	}()
 
 	router := rstatic.NewRouter(
 		router.WithHandler(rpc.Handler),
@@ -244,7 +257,9 @@ func TestRouterStaticPcre(t *testing.T) {
 	go func() {
 		log.Println(hsrv.ListenAndServe())
 	}()
-	defer hsrv.Close()
+	defer func() {
+		hsrv.Close()
+	}()
 
 	time.Sleep(1 * time.Second)
 	check(t, hsrv.Addr, "http://%s/api/v0/test/call", `{"msg":"Hello "}`, false)
@@ -252,7 +267,9 @@ func TestRouterStaticPcre(t *testing.T) {
 
 func TestRouterStaticGpath(t *testing.T) {
 	s, c := initial(t)
-	defer s.Stop()
+	defer func() {
+		_ = s.Stop()
+	}()
 
 	router := rstatic.NewRouter(
 		router.WithHandler(rpc.Handler),
@@ -285,7 +302,9 @@ func TestRouterStaticGpath(t *testing.T) {
 	go func() {
 		log.Println(hsrv.ListenAndServe())
 	}()
-	defer hsrv.Close()
+	defer func() {
+		_ = hsrv.Close()
+	}()
 
 	time.Sleep(1 * time.Second)
 	check(t, hsrv.Addr, "http://%s/api/v0/test/call/TEST", `{"msg":"Hello TEST"}`, false)
@@ -296,7 +315,9 @@ func TestRouterStaticPcreInvalid(t *testing.T) {
 	var err error
 
 	s, c := initial(t)
-	defer s.Stop()
+	defer func() {
+		_ = s.Stop()
+	}()
 
 	router := rstatic.NewRouter(
 		router.WithHandler(rpc.Handler),
diff --git a/broker/segmentio/broker_test.go b/broker/segmentio/broker_test.go
index 0092c88..ed479d7 100644
--- a/broker/segmentio/broker_test.go
+++ b/broker/segmentio/broker_test.go
@@ -38,12 +38,14 @@ var (
 )
 
 func TestConsumerGroup(t *testing.T) {
-	topic := fmt.Sprintf("test_topic")
+	topic := "test_topic"
 	if tr := os.Getenv("INTEGRATION_TESTS"); len(tr) > 0 {
 		t.Skip()
 	}
 
-	logger.DefaultLogger.Init(logger.WithLevel(logger.TraceLevel))
+	if err := logger.DefaultLogger.Init(logger.WithLevel(logger.TraceLevel)); err != nil {
+		t.Fatal(err)
+	}
 	ctx := context.Background()
 
 	var addrs []string
@@ -189,12 +191,14 @@ func TestConsumerGroup(t *testing.T) {
 }
 
 func TestSub(t *testing.T) {
-	topic := fmt.Sprintf("test_topic")
+	topic := "test_topic"
 	if tr := os.Getenv("INTEGRATION_TESTS"); len(tr) > 0 {
 		t.Skip()
 	}
 
-	logger.DefaultLogger.Init(logger.WithLevel(logger.ErrorLevel))
+	if err := logger.DefaultLogger.Init(logger.WithLevel(logger.ErrorLevel)); err != nil {
+		t.Fatal(err)
+	}
 	ctx := context.Background()
 
 	var addrs []string
@@ -256,6 +260,7 @@ func TestSub(t *testing.T) {
 	}()
 
 	fmt.Printf("prefill topic\n")
+
 	go func() {
 		for i := 0; i < 900000; i++ {
 			if err := brk.Publish(ctx, topic, bm); err != nil {
@@ -326,7 +331,9 @@ func BenchmarkPub(b *testing.B) {
 		b.Skip()
 	}
 
-	logger.DefaultLogger.Init(logger.WithLevel(logger.TraceLevel))
+	if err := logger.DefaultLogger.Init(logger.WithLevel(logger.TraceLevel)); err != nil {
+		b.Fatal(err)
+	}
 	ctx := context.Background()
 
 	var addrs []string
@@ -415,7 +422,7 @@ func BenchmarkPub(b *testing.B) {
 func BenchmarkPubSub(b *testing.B) {
 	b.Skip()
 	ctx := context.Background()
-	topic := fmt.Sprintf("test_topic")
+	topic := "test_topic"
 	var addrs []string
 	if addr := os.Getenv("BROKER_ADDRS"); len(addr) == 0 {
 		addrs = []string{"127.0.0.1:9092"}
@@ -500,7 +507,9 @@ func TestPubSub(t *testing.T) {
 		t.Skip()
 	}
 
-	logger.DefaultLogger.Init(logger.WithLevel(logger.ErrorLevel))
+	if err := logger.DefaultLogger.Init(logger.WithLevel(logger.ErrorLevel)); err != nil {
+		t.Fatal(err)
+	}
 	ctx := context.Background()
 
 	var addrs []string
diff --git a/flow/flow_test.go b/flow/flow_test.go
index dd7f32f..deac080 100644
--- a/flow/flow_test.go
+++ b/flow/flow_test.go
@@ -118,14 +118,21 @@ func TestFlow(t *testing.T) {
 	}
 
 	id, err := w.Execute(ctx, &flow.Message{Body: req}, flow.ExecuteTimeout(2*time.Second))
-	keys, err := s.List(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	var keys []string
+	keys, err = s.List(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = keys
 	keys, err = store.NewNamespaceStore(s, filepath.Join("workflows", id)).List(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
+	_ = keys
 	keys, err = store.NewNamespaceStore(s, filepath.Join("steps", id)).List(ctx)
 	if err != nil {
 		t.Fatal(err)
diff --git a/server/http/http_test.go b/server/http/http_test.go
index 7001b2d..0fdbfbc 100644
--- a/server/http/http_test.go
+++ b/server/http/http_test.go
@@ -101,7 +101,9 @@ func TestMultipart(t *testing.T) {
 	}
 
 	h := &Handler{t: t}
-	pb.RegisterTestServer(srv, h)
+	if err := pb.RegisterTestServer(srv, h); err != nil {
+		t.Fatal(err)
+	}
 
 	// start server
 	if err := srv.Start(); err != nil {
@@ -140,9 +142,6 @@ func NewServerHandlerWrapper(t *testing.T) server.HandlerWrapper {
 				t.Fatal("metadata empty")
 			}
 			if v, ok := md.Get("Authorization"); ok && v == "test" {
-				type err struct {
-					detail string
-				}
 				nmd := metadata.New(1)
 				nmd.Set("my-key", "my-val")
 				nmd.Set("Content-Type", "text/xml")
@@ -234,7 +233,9 @@ func TestNativeFormUrlencoded(t *testing.T) {
 		t.Fatal(err)
 	}
 	h := &Handler{t: t}
-	pb.RegisterTestServer(srv, h)
+	if err := pb.RegisterTestServer(srv, h); err != nil {
+		t.Fatal(err)
+	}
 
 	// start server
 	if err := srv.Start(); err != nil {
@@ -266,6 +267,9 @@ func TestNativeFormUrlencoded(t *testing.T) {
 	req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("http://%s/v1/test/call/my_name", service[0].Nodes[0].Address), strings.NewReader(data.Encode())) // URL-encoded payload
 	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
 	//req.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	rsp, err := http.DefaultClient.Do(req)
 	if err != nil {
@@ -432,8 +436,11 @@ func TestNativeClientServer(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer hrsp.Body.Close()
-	buf, err := io.ReadAll(hrsp.Body)
+	defer func() {
+		_ = hrsp.Body.Close()
+	}()
+
+	_, err = io.ReadAll(hrsp.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -460,7 +467,7 @@ func TestNativeClientServer(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	buf, err = io.ReadAll(hrsp.Body)
+	buf, err := io.ReadAll(hrsp.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -491,7 +498,9 @@ func TestNativeServer(t *testing.T) {
 	)
 
 	h := &Handler{t: t}
-	pb.RegisterTestServer(srv, h)
+	if err := pb.RegisterTestServer(srv, h); err != nil {
+		t.Fatal(err)
+	}
 
 	// start server
 	if err := srv.Start(); err != nil {
@@ -633,7 +642,7 @@ func TestHTTPHandler(t *testing.T) {
 	// create server mux
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte(`hello world`))
+		_, _ = w.Write([]byte(`hello world`))
 	})
 
 	// create handler
@@ -692,7 +701,7 @@ func TestHTTPServer(t *testing.T) {
 	// create server mux
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte(`hello world`))
+		_, _ = w.Write([]byte(`hello world`))
 	})
 
 	// create server
diff --git a/server/tcp/tcp_test.go b/server/tcp/tcp_test.go
index e661498..cc9f423 100644
--- a/server/tcp/tcp_test.go
+++ b/server/tcp/tcp_test.go
@@ -65,14 +65,6 @@ func TestTCPServer(t *testing.T) {
 		t.Fatalf("Expected 1 node got %d: %+v", len(service[0].Nodes), service[0].Nodes)
 	}
 
-	go func() {
-		<-h.done
-		// stop server
-		if err := srv.Stop(); err != nil {
-			t.Fatal(err)
-		}
-	}()
-
 	c, err := net.DialTimeout("tcp", srv.Options().Address, 5*time.Second)
 	if err != nil {
 		t.Fatal(err)
@@ -82,6 +74,12 @@ func TestTCPServer(t *testing.T) {
 	if _, err = c.Write([]byte("test")); err != nil {
 		t.Fatal(err)
 	}
+
+	<-h.done
+	// stop server
+	if err := srv.Stop(); err != nil {
+		t.Fatal(err)
+	}
 }
 
 func (h *testHandler) Serve(c net.Conn) {
diff --git a/wrapper/metrics/prometheus/prometheus_test.go b/wrapper/metrics/prometheus/prometheus_test.go
index 77670e4..f39d59d 100644
--- a/wrapper/metrics/prometheus/prometheus_test.go
+++ b/wrapper/metrics/prometheus/prometheus_test.go
@@ -1,3 +1,5 @@
+// +build ignore
+
 package prometheus_test
 
 import (
@@ -14,7 +16,7 @@ import (
 	srv "github.com/unistack-org/micro-server-grpc/v3"
 	"github.com/unistack-org/micro/v3/broker"
 	"github.com/unistack-org/micro/v3/client"
-	errors "github.com/unistack-org/micro/v3/errors"
+	"github.com/unistack-org/micro/v3/errors"
 	"github.com/unistack-org/micro/v3/register"
 	"github.com/unistack-org/micro/v3/router"
 	"github.com/unistack-org/micro/v3/server"
@@ -39,7 +41,6 @@ func (t *testHandler) Method(ctx context.Context, req *TestRequest, rsp *TestRes
 }
 
 func TestPrometheusMetrics(t *testing.T) {
-	t.Skip("not implemented now")
 	// setup
 	reg := register.NewRegister()
 	brk := broker.NewBroker(broker.Register(reg))
@@ -78,14 +79,16 @@ func TestPrometheusMetrics(t *testing.T) {
 		*testHandler
 	}
 
-	s.Handle(
-		s.NewHandler(&Test{new(testHandler)}),
-	)
+	if err := s.Handle(s.NewHandler(&Test{new(testHandler)})); err != nil {
+		t.Fatal(err)
+	}
 
 	if err := s.Start(); err != nil {
 		t.Fatalf("Unexpected error starting server: %v", err)
 	}
-	defer s.Stop()
+	defer func() {
+		_ = s.Stop()
+	}()
 
 	req := c.NewRequest(name, "Test.Method", &TestRequest{IsError: false}, client.RequestContentType("application/json"))
 	rsp := TestResponse{}
diff --git a/wrapper/trace/opentracing/opentracing_test.go b/wrapper/trace/opentracing/opentracing_test.go
index 7fd988e..feda47b 100644
--- a/wrapper/trace/opentracing/opentracing_test.go
+++ b/wrapper/trace/opentracing/opentracing_test.go
@@ -99,7 +99,9 @@ func TestClient(t *testing.T) {
 			if err := s.Init(); err != nil {
 				t.Fatal(err)
 			}
-			defer s.Stop()
+			defer func() {
+				_ = s.Stop()
+			}()
 
 			type Test struct {
 				*testHandler