in stream_logger.go [42:49]
func (s *StreamLogger) Logf(t testing.TestingT, format string, args ...interface{}) {
log := fmt.Sprintf(format, args...)
logger.DoLog(t, 3, s.stream, log)
s.logCount++
if s.outputProgress && s.logCount%50 == 0 {
logger.Log(t, fmt.Sprintf("logging sample: %s", log))
}
}