diff --git a/go.mod b/go.mod
index 3d4101b..6c87886 100644
--- a/go.mod
+++ b/go.mod
@@ -4,13 +4,14 @@ go 1.21
 
 require (
 	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.9.0
 )
 
 require (
-	github.com/davecgh/go-spew v1.1.0 // indirect
-	github.com/kr/pretty v0.2.1 // indirect
-	github.com/kr/text v0.1.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+	github.com/rogpeppe/go-internal v1.12.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 336a246..cd76fc7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,18 +1,21 @@
 github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 h1:DDGfHa7BWjL4YnC6+E63dPcxHo2sUxDIu8g3QgEJdRY=
 github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
-github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+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/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 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/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
-github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
+github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/leetcode_91_2/2020/0447/447. Number of Boomerangs.go b/leetcode_91_2/2020/0447/447. Number of Boomerangs.go
index eb78905..1100c6c 100644
--- a/leetcode_91_2/2020/0447/447. Number of Boomerangs.go	
+++ b/leetcode_91_2/2020/0447/447. Number of Boomerangs.go	
@@ -1,7 +1,5 @@
 package _447
 
-import "fmt"
-
 func numberOfBoomerangs(points [][]int) int {
 	res := 0
 	for i := 0; i < len(points); i++ {
@@ -10,7 +8,7 @@ func numberOfBoomerangs(points [][]int) int {
 			if i != j {
 				d := distanceCalc(points[i], points[j])
 				v, ok := distance[d]
-				fmt.Printf("d is %v\n", d)
+				//fmt.Printf("d is %v\n", d)
 				if ok { // 存在
 					res += 2 * v // (v+1) * v - [v * (v-1)] = 2 * v
 					distance[d] += 1
diff --git a/leetcode_91_2/2020/0447/447. Number of Boomerangs_test.go b/leetcode_91_2/2020/0447/447. Number of Boomerangs_test.go
index 72d6da3..8160cd2 100644
--- a/leetcode_91_2/2020/0447/447. Number of Boomerangs_test.go	
+++ b/leetcode_91_2/2020/0447/447. Number of Boomerangs_test.go	
@@ -16,4 +16,12 @@ func TestNumberOfBoomerangs(t *testing.T) {
 		}),
 		"must be 2",
 	)
+	assert.Equal(t, 2,
+		numberOfBoomerangs1([][]int{
+			{0, 0},
+			{1, 0},
+			{2, 0},
+		}),
+		"must be 2",
+	)
 }
diff --git a/topic/stack_queue/225. Implement Stack using Queues.go b/topic/stack_queue/225. Implement Stack using Queues.go
index 0b02546..efe615e 100644
--- a/topic/stack_queue/225. Implement Stack using Queues.go	
+++ b/topic/stack_queue/225. Implement Stack using Queues.go	
@@ -5,13 +5,6 @@ type MyStack struct {
 	Queue2 []int
 }
 
-func stackConstructor() MyStack {
-	return MyStack{
-		Queue1: make([]int, 0),
-		Queue2: make([]int, 0),
-	}
-}
-
 func (m *MyStack) Push(x int) {
 	if len(m.Queue2) != 0 {
 		m.Queue2 = append(m.Queue2, x)
diff --git a/topic/stack_queue/225. Implement Stack using Queues_test.go b/topic/stack_queue/225. Implement Stack using Queues_test.go
index e9341f5..d3b4b90 100644
--- a/topic/stack_queue/225. Implement Stack using Queues_test.go	
+++ b/topic/stack_queue/225. Implement Stack using Queues_test.go	
@@ -1,6 +1,10 @@
 package stack_queue
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/bmizerany/assert"
+)
 
 func TestMyStack_Pop(t *testing.T) {
 	type fields struct {
@@ -41,3 +45,22 @@ func TestMyStack_Pop(t *testing.T) {
 		})
 	}
 }
+
+func TestMyStack(t *testing.T) {
+	m := &MyStack{}
+
+	assert.Equal(t, true, m.Empty())
+	// Test when Queue2 is empty
+	m.Push(1)
+	if len(m.Queue1) != 1 {
+		t.Errorf("Expected Queue1 length to be 1, got %d", len(m.Queue1))
+	}
+	assert.Equal(t, false, m.Empty())
+
+	m.Push(2)
+
+	assert.Equal(t, 2, m.Top())
+	assert.Equal(t, 2, m.Pop())
+	m.Push(3)
+	assert.Equal(t, 3, m.Top())
+}