diff --git a/core/mapping/fieldoptions_test.go b/core/mapping/fieldoptions_test.go
new file mode 100644
index 00000000..01f2f2da
--- /dev/null
+++ b/core/mapping/fieldoptions_test.go
@@ -0,0 +1,31 @@
+package mapping
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type Bar struct {
+	Val string `json:"val"`
+}
+
+func TestFieldOptionOptionalDep(t *testing.T) {
+	var bar Bar
+	rt := reflect.TypeOf(bar)
+	for i := 0; i < rt.NumField(); i++ {
+		field := rt.Field(i)
+		val, opt, err := parseKeyAndOptions(jsonTagKey, field)
+		assert.Equal(t, "val", val)
+		assert.Nil(t, opt)
+		assert.Nil(t, err)
+	}
+
+	// check nil working
+	var o *fieldOptions
+	check := func(o *fieldOptions) {
+		assert.Equal(t, 0, len(o.optionalDep()))
+	}
+	check(o)
+}
diff --git a/core/mapping/unmarshaler_test.go b/core/mapping/unmarshaler_test.go
index da23d599..b1cd1e53 100644
--- a/core/mapping/unmarshaler_test.go
+++ b/core/mapping/unmarshaler_test.go
@@ -2387,6 +2387,13 @@ func TestUnmarshalNestedMapSimpleTypeMatch(t *testing.T) {
 	assert.Equal(t, "1", c.Anything["id"])
 }
 
+func TestUnmarshalValuer(t *testing.T) {
+	unmarshaler := NewUnmarshaler(jsonTagKey)
+	var foo string
+	err := unmarshaler.UnmarshalValuer(nil, foo)
+	assert.NotNil(t, err)
+}
+
 func BenchmarkUnmarshalString(b *testing.B) {
 	type inner struct {
 		Value string `key:"value"`
diff --git a/core/proc/goroutines_test.go b/core/proc/goroutines_test.go
new file mode 100644
index 00000000..4a4685d8
--- /dev/null
+++ b/core/proc/goroutines_test.go
@@ -0,0 +1,16 @@
+package proc
+
+import (
+	"log"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDumpGoroutines(t *testing.T) {
+	var buf strings.Builder
+	log.SetOutput(&buf)
+	dumpGoroutines()
+	assert.True(t, strings.Contains(buf.String(), ".dump"))
+}
diff --git a/core/proc/profile_test.go b/core/proc/profile_test.go
new file mode 100644
index 00000000..a5353a59
--- /dev/null
+++ b/core/proc/profile_test.go
@@ -0,0 +1,21 @@
+package proc
+
+import (
+	"log"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestProfile(t *testing.T) {
+	var buf strings.Builder
+	log.SetOutput(&buf)
+	profiler := StartProfile()
+	// start again should not work
+	assert.NotNil(t, StartProfile())
+	profiler.Stop()
+	// stop twice
+	profiler.Stop()
+	assert.True(t, strings.Contains(buf.String(), ".pprof"))
+}
diff --git a/example/rpc/server/unary/server.go b/example/rpc/server/unary/server.go
index 75e9846f..115cf1c2 100644
--- a/example/rpc/server/unary/server.go
+++ b/example/rpc/server/unary/server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"log"
 	"os"
 	"sync"
 	"time"
@@ -50,5 +51,13 @@ func main() {
 	server := zrpc.MustNewServer(c, func(grpcServer *grpc.Server) {
 		unary.RegisterGreeterServer(grpcServer, NewGreetServer())
 	})
+	interceptor := func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
+		st := time.Now()
+		resp, err = handler(ctx, req)
+		log.Printf("method: %s time: %v\n", info.FullMethod, time.Since(st))
+		return resp, err
+	}
+
+	server.AddUnaryInterceptors(interceptor)
 	server.Start()
 }
diff --git a/zrpc/server.go b/zrpc/server.go
index 90c8150e..06aa08c9 100644
--- a/zrpc/server.go
+++ b/zrpc/server.go
@@ -67,15 +67,15 @@ func NewServer(c RpcServerConf, register internal.RegisterFn) (*RpcServer, error
 }
 
 func (rs *RpcServer) AddOptions(options ...grpc.ServerOption) {
-	rs.AddOptions(options...)
+	rs.server.AddOptions(options...)
 }
 
 func (rs *RpcServer) AddStreamInterceptors(interceptors ...grpc.StreamServerInterceptor) {
-	rs.AddStreamInterceptors(interceptors...)
+	rs.server.AddStreamInterceptors(interceptors...)
 }
 
 func (rs *RpcServer) AddUnaryInterceptors(interceptors ...grpc.UnaryServerInterceptor) {
-	rs.AddUnaryInterceptors(interceptors...)
+	rs.server.AddUnaryInterceptors(interceptors...)
 }
 
 func (rs *RpcServer) Start() {