diff --git a/go/testing/error/error_test.go b/go/testing/error/error_test.go
new file mode 100644
index 0000000..00f1c89
--- /dev/null
+++ b/go/testing/error/error_test.go
@@ -0,0 +1,34 @@
+package error
+
+import (
+	"errors"
+	"fmt"
+	"testing"
+)
+
+type MatchError struct {
+	code int
+	err  error
+}
+
+func (e *MatchError) Error() string {
+	return fmt.Sprintf("code: %d, error: %v", e.code, e.err)
+}
+func GetMatchError() error {
+	return &MatchError{code: 1, err: errors.New("123")}
+}
+func GetError() error {
+	return errors.New("123")
+}
+func TestError(t *testing.T) {
+	if err, ok := errors.AsType[*MatchError](GetMatchError()); ok {
+		t.Log(err)
+	} else {
+		t.Errorf("expected MatchError, got %T", GetMatchError())
+	}
+	if err, ok := errors.AsType[*MatchError](GetError()); ok {
+		t.Log(err)
+	} else {
+		t.Errorf("expected MatchError, got %T", GetError())
+	}
+}
diff --git a/go/testing/net/net_test.go b/go/testing/net/net_test.go
new file mode 100644
index 0000000..6877f21
--- /dev/null
+++ b/go/testing/net/net_test.go
@@ -0,0 +1,18 @@
+package net
+
+import (
+	"net"
+	"testing"
+)
+
+func TestNet(t *testing.T) {
+	s := net.JoinHostPort("127.0.0.1", "8080")
+
+	t.Log(s)
+	t.Log(s)
+	addrs, err := net.LookupAddr("198.18.0.18")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Log(addrs)
+}
diff --git a/go/testing/regularMatch/regexp_test.go b/go/testing/regularMatch/regexp_test.go
index 444bbea..49c54fb 100644
--- a/go/testing/regularMatch/regexp_test.go
+++ b/go/testing/regularMatch/regexp_test.go
@@ -19,3 +19,16 @@ func TestChineseRegExp(t *testing.T) {
 		t.Errorf("Expected [世, 界], got %v", matchStrSlice)
 	}
 }
+
+func TestChinaMobile(t *testing.T) {
+	reg, err := regexp.Compile(`^1(3\d|4[5-9]|5[0-35-9]|6[2567]|7[0-8]|8\d|9[0-35-9])\d{8}$`)
+	if err != nil {
+		t.Errorf("Failed to compile regex: %v", err)
+	}
+	// matchStrSlice := reg.FindAllString("123-12345678 1234-12345678", -1)
+	// if len(matchStrSlice) != 2 {
+	// 	t.Errorf("Expected 2 matches, got %d", len(matchStrSlice))
+	// }
+	matchStrSlice := reg.FindAllString("17623862704", -1)
+	t.Log(matchStrSlice[0])
+}