update go.mod

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

codec/codec_test.go

@@ -1,46 +0,0 @@
-package codec_test
-
-import (
-	"testing"
-
-	grpc "go.unistack.org/micro-codec-grpc/v3"
-	json "go.unistack.org/micro-codec-json/v3"
-	proto "go.unistack.org/micro-codec-proto/v3"
-	"go.unistack.org/micro/v3/codec"
-)
-
-type testRWC struct{}
-
-func (rwc *testRWC) Read(p []byte) (n int, err error) {
-	return 0, nil
-}
-
-func (rwc *testRWC) Write(p []byte) (n int, err error) {
-	return 0, nil
-}
-
-func (rwc *testRWC) Close() error {
-	return nil
-}
-
-func getCodecs() map[string]codec.Codec {
-	return map[string]codec.Codec{
-		"bytes": codec.NewCodec(),
-		"grpc":  grpc.NewCodec(),
-		"json":  json.NewCodec(),
-		"proto": proto.NewCodec(),
-	}
-}
-
-func Test_WriteEmptyBody(t *testing.T) {
-	rw := &testRWC{}
-	for name, c := range getCodecs() {
-		err := c.Write(rw, &codec.Message{
-			Type:   codec.Error,
-			Header: map[string]string{},
-		}, nil)
-		if err != nil {
-			t.Fatalf("codec %s - expected no error when writing empty/nil body: %s", name, err)
-		}
-	}
-}