refine result package

result/example_test.go

@@ -3,8 +3,10 @@ package result_test
 import (
 	"fmt"
 	"strconv"
+	"testing"
 
 	"github.com/ayonli/goext/result"
+	"github.com/stretchr/testify/assert"
 )
 
 func ExampleWrap() {
@@ -44,3 +46,17 @@ func ExampleUnwrap() {
 	// Output:
 	// 30
 }
+
+func TestWrap(t *testing.T) {
+	mathAdd := func(input1 string, input2 string) (int, error) {
+		return result.Wrap(func() (int, error) {
+			num1 := result.Unwrap(strconv.Atoi(input1))
+			num2 := result.Unwrap(strconv.Atoi(input2))
+			return num1 + num2, nil
+		})
+	}
+
+	res, err := mathAdd("10", "b")
+	assert.Equal(t, 0, res)
+	assert.Equal(t, "strconv.Atoi: parsing \"b\": invalid syntax", err.Error())
+}

result/result.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 )
 
-func Wrap[R any](fn func() (value R, err error)) (value R, err error) {
+func Wrap[T any](fn func() (value T, err error)) (value T, err error) {
 	defer func() {
 		if re := recover(); re != nil {
 			if _err, ok := re.(error); ok {