Update errcause_test.go

Author: 1997y1

x/errcause/errcause_test.go

@@ -1,26 +1,27 @@
-package errcause_test
+package main
 
 import (
+	"github.com/matsuwin/siggroup/x/errcause"
 	"github.com/pkg/errors"
 	"io/ioutil"
-	"testing"
-
-	"github.com/matsuwin/siggroup/x/errcause"
 )
 
-func Test(t *testing.T) {
+func mkError() error {
+	_, err := ioutil.ReadFile("xxx.txt")
+	return errors.New(err.Error())
+}
+
+func main() {
+	
+	// 错误恢复 recover call errcause.Keep
 	defer func() {
 		if ei := recover(); ei != nil {
 			errcause.Keep(ei)
 		}
 	}()
 
+	// 模拟一个错误抛出调用
 	if err := mkError(); err != nil {
 		panic(err)
 	}
 }
-
-func mkError() error {
-	_, err := ioutil.ReadFile("xxx.txt")
-	return errors.New(err.Error())
-}