config/default: not implement watcher as it cant change

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

config/default_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"testing"
-	"time"
 
 	"github.com/unistack-org/micro/v3/config"
 )
@@ -18,55 +17,6 @@ type Cfg struct {
 	IntValue int `default:"99"`
 }
 
-func TestWatch(t *testing.T) {
-	ctx := context.Background()
-
-	conf := &Cfg{IntValue: 10}
-
-	cfg := config.NewConfig(config.Struct(conf))
-	if err := cfg.Init(); err != nil {
-		t.Fatal(err)
-	}
-	if err := cfg.Load(ctx); err != nil {
-		t.Fatal(err)
-	}
-
-	w, err := cfg.Watch(ctx, config.WatchInterval(200*time.Millisecond, 500*time.Millisecond))
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	defer func() {
-		_ = w.Stop()
-	}()
-
-	done := make(chan struct{})
-
-	go func() {
-		for {
-			mp, err := w.Next()
-			if err != nil {
-				t.Fatal(err)
-			}
-			if len(mp) != 1 {
-				t.Fatal(fmt.Errorf("default watcher err: %v", mp))
-			}
-
-			v, ok := mp["IntValue"]
-			if !ok {
-				t.Fatal(fmt.Errorf("default watcher err: %v", v))
-			}
-			if nv, ok := v.(int); !ok || nv != 99 {
-				t.Fatal(fmt.Errorf("default watcher err: %v", v))
-			}
-			close(done)
-			return
-		}
-	}()
-
-	<-done
-}
-
 func TestDefault(t *testing.T) {
 	ctx := context.Background()
 	conf := &Cfg{IntValue: 10}