*: remove useless test

Signed-off-by: xhe <xw897002528@gmail.com>

util/logutil/log_test.go

@@ -100,21 +100,6 @@ func TestSetLevel(t *testing.T) {
 	require.Equal(t, zap.DebugLevel, log.GetLevel())
 }
 
-func TestGrpcLoggerCreation(t *testing.T) {
-	level := "info"
-	conf := NewLogConfig(level, DefaultLogFormat, "", EmptyFileLogConfig, false)
-	_, p, err := initGRPCLogger(conf)
-	// assert after init grpc logger, the original conf is not changed
-	require.Equal(t, conf.Level, level)
-	require.NoError(t, err)
-	require.Equal(t, p.Level.Level(), zap.ErrorLevel)
-	os.Setenv("GRPC_DEBUG", "1")
-	defer os.Unsetenv("GRPC_DEBUG")
-	_, newP, err := initGRPCLogger(conf)
-	require.NoError(t, err)
-	require.Equal(t, newP.Level.Level(), zap.DebugLevel)
-}
-
 func TestSlowQueryLoggerCreation(t *testing.T) {
 	level := "Error"
 	conf := NewLogConfig(level, DefaultLogFormat, "", EmptyFileLogConfig, false)