// TestLogLevelDEV tests the basic functioning of the logger in DEV mode.
func TestLogLevelDEV(t *testing.T) {
t.Log("Given the need to log DEV and USER messages.")
{
t.Log("\tWhen we set the logging level to DEV.")
{
log.Init(&logdest, func() int { return log.DEV })
resetLog()
defer displayLog()
dt := time.Now().Format("2006/01/02 15:04:05")
log1 := fmt.Sprintf("%s log_test.go:81: DEV : context : FuncName : Message 1 no format\n", dt)
log2 := fmt.Sprintf("%s log_test.go:82: USER : context : FuncName : Message 2 with format: A, B\n", dt)
log3 := fmt.Sprintf("%s log_test.go:83: ERROR : context : FuncName : An error : Message 3 with format: C, D\n", dt)
log.Dev("context", "FuncName", "Message 1 no format")
log.User("context", "FuncName", "Message 2 with format: %s, %s", "A", "B")
log.Error("context", "FuncName", errors.New("An error"), "Message 3 with format: %s, %s", "C", "D")
if logdest.String() == log1+log2+log3 {
t.Logf("\t\t%v : Should log the expected trace line.", succeed)
} else {
t.Log("***>", logdest.String())
t.Log("***>", log1+log2+log3)
t.Errorf("\t\t%v : Should log the expected trace line.", failed)
}
}
}
}
// ExampleDev shows how to use the log package.
func ExampleDev(t *testing.T) {
// Init the log package for stdout. Hardcode the logging level
// function to use USER level logging.
log.Init(os.Stdout, func() int { return log.USER })
// Write a simple log line with no formatting.
log.User("context", "ExampleDev", "This is a simple line with no formatting")
// Write a simple log line with formatting.
log.User("context", "ExampleDev", "This is a simple line with no formatting %d", 10)
// Write a message error for the user.
log.Error("context", "ExampleDev", errors.New("A user error"), "testing error")
// Write a message error for the user with formatting.
log.Error("context", "ExampleDev", errors.New("A user error"), "testing error %s", "value")
// Write a message error for the developer only.
log.Dev("context", "ExampleDev", "Formatting %v", 42)
}