func DiscardLog() Logger {
	return &discardLog{}
}
DiscardLog creates a Logger that discards all messages.
package gofakes3
import "log"
type LogLevel string
const (
	LogErr  LogLevel = "ERR"
	LogWarn LogLevel = "WARN"
	LogInfo LogLevel = "INFO"
)
type Logger interface {
	Print(level LogLevel, v ...interface{})
}
func GlobalLog(levels ...LogLevel) Logger {
	return newStdLog(log.Println, levels...)
}
func StdLog(log *log.Logger, levels ...LogLevel) Logger {
	return newStdLog(log.Println, levels...)
}