add badflag test

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

flag.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"os"
 	"reflect"
 	"time"
 
@@ -44,6 +45,7 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 		return err
 	}
 
+	flag.CommandLine.Init(os.Args[0], flag.ContinueOnError)
 	for _, sf := range fields {
 		tf, ok := sf.Field.Tag.Lookup(c.opts.StructTag)
 		if !ok {

flag_test.go

@@ -18,21 +18,23 @@ func TestLoad(t *testing.T) {
 	os.Args = append(os.Args, "-time", time.RFC822)
 	os.Args = append(os.Args, "-metadata", "key=20")
 	os.Args = append(os.Args, "-components", "all=info,api=debug")
+	os.Args = append(os.Args, "-addr", "33,44")
+	os.Args = append(os.Args, "-badflag", "test")
 	type NestedConfig struct {
 		Value string `flag:"name=nested_value"`
 	}
 	type Config struct {
-		Broker         string            `flag:"name=broker,desc='description with, comma',default='127.0.0.1:9092'"`
-		Verbose        bool              `flag:"name=verbose,desc='verbose output',default='false'"`
-		Addr           []string          `flag:"name=addr,desc='addrs',default='127.0.0.1:9092'"`
-		Wait           time.Duration     `flag:"name=wait,desc='wait time',default='2s'"`
 		Time           time.Time         `flag:"name=time,desc='some time',default='02 Jan 06 15:04 MST'"`
+		Components     map[string]string `flag:"name=components,desc='components logging'"`
 		Metadata       map[string]int    `flag:"name=metadata,desc='some meta',default=''"`
-		WithoutDefault string            `flag:"name=without_default,desc='with'"`
+		Nested         *NestedConfig
+		Broker         string        `flag:"name=broker,desc='description with, comma',default='127.0.0.1:9092'"`
 		WithoutDesc    string        `flag:"name=without_desc,default='without_default'"`
 		WithoutAll     string        `flag:"name=without_all"`
-		Components     map[string]string `flag:"name=components,desc='components logging'"`
-		Nested         *NestedConfig
+		WithoutDefault string        `flag:"name=without_default,desc='with'"`
+		Addr           []string      `flag:"name=addr,desc='addrs',default='127.0.0.1:9092'"`
+		Wait           time.Duration `flag:"name=wait,desc='wait time',default='2s'"`
+		Verbose        bool          `flag:"name=verbose,desc='verbose output',default='false'"`
 	}
 
 	ctx := context.Background()

util.go

@@ -10,9 +10,9 @@ import (
 )
 
 type mapValue struct {
-	v     reflect.Value
 	delim string
 	def   string
+	v     reflect.Value
 }
 
 func (v mapValue) String() string {
@@ -67,9 +67,9 @@ func (v mapValue) Set(s string) error {
 }
 
 type sliceValue struct {
-	v     reflect.Value
 	delim string
 	def   string
+	v     reflect.Value
 }
 
 func (v sliceValue) String() string {