// The defaultHandler will use whatever the log default writer is currently
	// set to, which is correct.
	// This can occur with SetDefault(Default()).
	// See TestSetDefault.
	if _, ok := l.Handler().(*defaultHandler); !ok {
		capturePC := log.Flags()&(log.Lshortfile|log.Llongfile) != 0
		log.SetOutput(&handlerWriter{l.Handler(), &logLoggerLevel, capturePC})

		r.Add(test.args...)
		got := attrsSlice(r)
		if !attrsEqual(got, test.want) {
			t.Errorf("%v:\ngot  %v\nwant %v", test.args, got, test.want)
		}
	}
}

func TestSetDefault(t *testing.T) {
	// Verify that setting the default to itself does not result in deadlock.
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()