github.com/jiajun1992/watercarver@v0.0.0-20191031150618-dfc2b17c0c4a/go-ethereum/internal/testlog/testlog.go (about)

     1  // Copyright 2019 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // Package testlog provides a log handler for unit tests.
    18  package testlog
    19  
    20  import (
    21  	"testing"
    22  
    23  	"github.com/ethereum/go-ethereum/log"
    24  )
    25  
    26  // Logger returns a logger which logs to the unit test log of t.
    27  func Logger(t *testing.T, level log.Lvl) log.Logger {
    28  	l := log.New()
    29  	l.SetHandler(Handler(t, level))
    30  	return l
    31  }
    32  
    33  // Handler returns a log handler which logs to the unit test log of t.
    34  func Handler(t *testing.T, level log.Lvl) log.Handler {
    35  	return log.LvlFilterHandler(level, &handler{t, log.TerminalFormat(false)})
    36  }
    37  
    38  type handler struct {
    39  	t   *testing.T
    40  	fmt log.Format
    41  }
    42  
    43  func (h *handler) Log(r *log.Record) error {
    44  	h.t.Logf("%s", h.fmt.Format(r))
    45  	return nil
    46  }