go-ethereum/ethlog/loggers_test.go

package ethlog

import (
  "testing"
  "fmt"
  "io/ioutil"
  "os"
)

type TestLogSystem struct {
  Output string
  level  LogLevel
}

func (t *TestLogSystem) Println(v ...interface{}) {
  t.Output += fmt.Sprintln(v...)
}

func (t *TestLogSystem) Printf(format string, v ...interface{}) {
  t.Output += fmt.Sprintf(format, v...)
}

func (t *TestLogSystem) SetLogLevel(i LogLevel) {
  t.level = i
}

func (t *TestLogSystem) GetLogLevel() LogLevel {
  return t.level
}

func quote(s string) string {
  return fmt.Sprintf("'%s'", s)
}

func TestLoggerPrintln(t *testing.T) {
  logger := NewLogger("TEST")
  testLogSystem := &TestLogSystem{level: WarnLevel}
  AddLogSystem(testLogSystem)
  logger.Errorln("error")
  logger.Warnln("warn")
  logger.Infoln("info")
  logger.Debugln("debug")
  Flush()
  output := testLogSystem.Output
  fmt.Println(quote(output))
  if output != "[TEST] error\n[TEST] warn\n" {
    t.Error("Expected logger output '[TEST] error\\n[TEST] warn\\n', got ", quote(testLogSystem.Output))
  }
}

func TestLoggerPrintf(t *testing.T) {
  logger := NewLogger("TEST")
  testLogSystem := &TestLogSystem{level: WarnLevel}
  AddLogSystem(testLogSystem)
  logger.Errorf("error to %v\n", *testLogSystem)
  logger.Warnf("warn")
  logger.Infof("info")
  logger.Debugf("debug")
  Flush()
  output := testLogSystem.Output
  fmt.Println(quote(output))
  if output != "[TEST] error to { 2}\n[TEST] warn" {
    t.Error("Expected logger output '[TEST] error to { 2}\\n[TEST] warn', got ", quote(testLogSystem.Output))
  }
}

func TestMultipleLogSystems(t *testing.T) {
  logger := NewLogger("TEST")
  testLogSystem0 := &TestLogSystem{level: ErrorLevel}
  testLogSystem1 := &TestLogSystem{level: WarnLevel}
  AddLogSystem(testLogSystem0)
  AddLogSystem(testLogSystem1)
  logger.Errorln("error")
  logger.Warnln("warn")
  Flush()
  output0 := testLogSystem0.Output
  output1 := testLogSystem1.Output
  if output0 != "[TEST] error\n" {
    t.Error("Expected logger 0 output '[TEST] error\\n', got ", quote(testLogSystem0.Output))
  }
  if output1 != "[TEST] error\n[TEST] warn\n" {
    t.Error("Expected logger 1 output '[TEST] error\\n[TEST] warn\\n', got ", quote(testLogSystem1.Output))
  }
}

func TestFileLogSystem(t *testing.T) {
  logger := NewLogger("TEST")
  filename := "test.log"
  file, _ := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, os.ModePerm)
  testLogSystem := NewStdLogSystem(file, 0, WarnLevel)
  AddLogSystem(testLogSystem)
  logger.Errorf("error to %s\n", filename)
  logger.Warnln("warn")
  Flush()
  contents, _ :=  ioutil.ReadFile(filename)
  output := string(contents)
  fmt.Println(quote(output))
  if output != "[TEST] error to test.log\n[TEST] warn\n" {
    t.Error("Expected contents of file 'test.log': '[TEST] error to test.log\\n[TEST] warn\\n', got ", quote(output))
  } else {
    os.Remove(filename)
  }
}

func TestNoLogSystem(t *testing.T) {
  logger := NewLogger("TEST")
  logger.Warnln("warn")
  Flush()
}