func (s *MockSpan) String() string {
	return fmt.Sprintf(
		"traceId=%d, spanId=%d, parentId=%d, sampled=%t, name=%s",
		s.SpanContext.TraceID, s.SpanContext.SpanID, s.ParentID,
		s.SpanContext.Sampled, s.OperationName)
}
func (s *MockSpan) String() string {
	return fmt.Sprintf(
		"traceId=%d, spanId=%d, parentId=%d, sampled=%t, name=%s",
		s.SpanContext.TraceID, s.SpanContext.SpanID, s.ParentID,
		s.SpanContext.Sampled, s.OperationName)
}
func ( s * MockSpan ) String ( ) string { return fmt . Sprintf ( " " , s . SpanContext . TraceID , s . SpanContext . SpanID , s . ParentID , s . SpanContext . Sampled , s . OperationName ) }
// String allows printing span for debugging
String allows printing span for debugging