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package logger
import (
"bufio"
"bytes"
"os"
"reflect"
"strings"
"testing"
)
func TestLoggingBeforeInit(t *testing.T) {
old := os.Stderr
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
os.Stderr = w
// Reset
initialize()
info := "info log"
warning := "warning log"
errL := "error log"
fatal := "fatal log"
Info(info)
Warning(warning)
Error(errL)
// We don't want os.Exit in a test
defaultLogger.output(sFatal, 0, fatal)
w.Close()
os.Stderr = old
var b bytes.Buffer
scanner := bufio.NewScanner(r)
for scanner.Scan() {
b.Write(scanner.Bytes())
}
out := b.String()
for _, txt := range []string{info, warning, errL, fatal} {
if !strings.Contains(out, txt) {
t.Errorf("log output %q does not contain expected text: %q", out, txt)
}
}
}
func TestInit(t *testing.T) {
var buf1 bytes.Buffer
l1 := Init("test1", false, false, &buf1)
if !reflect.DeepEqual(l1, defaultLogger) {
t.Fatal("defaultLogger does not match logger returned by Init")
}
// Subsequent runs of Init shouldn't change defaultLogger.
var buf2 bytes.Buffer
l2 := Init("test2", false, false, &buf2)
if !reflect.DeepEqual(l1, defaultLogger) {
t.Error("defaultLogger should not have changed")
}
// Check log output.
l1.Info("logger #1")
l2.Info("logger #2")
defaultLogger.Info("default logger")
tests := []struct {
out string
want int
}{
{buf1.String(), 2},
{buf2.String(), 1},
}
for i, tt := range tests {
got := len(strings.Split(strings.TrimSpace(tt.out), "\n"))
if got != tt.want {
t.Errorf("logger %d wrong number of lines, want %d, got %d", i+1, tt.want, got)
}
}
}
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