func (d *DebugLog) Printf(s string, args ...interface{}) {
	atomic.AddInt64(&d.n, 1)
	if testing.Verbose() {
		log.Printf(s, args...)
	}
}
Printf implements the LogFunc-compatible signature. It logs to log.Printf
if testing.Verbose is true.
package jugglertest
import (
	"log"
	"sync/atomic"
	"testing"
)
type DebugLog struct {
	T *testing.T
	n int64
}