package main

import (
	"os"
	"path/filepath"
	"testing"
)

func TestReadNetworkSnapshot(t *testing.T) {
	path := filepath.Join(t.TempDir(), "netdev")
	content := `Inter-| Receive | Transmit
 face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
    lo: 100 1 0 0 0 0 0 0 100 1 0 0 0 0 0 0
  eth0: 1200 2 0 0 0 0 0 0 3400 3 0 0 0 0 0 0
 vmbr0: 5600 4 0 0 0 0 0 0 7800 5 0 0 0 0 0 0
`
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatal(err)
	}

	snapshot, interfaces, err := readNetworkSnapshot(path)
	if err != nil {
		t.Fatal(err)
	}
	if snapshot.received != 6800 || snapshot.sent != 11200 {
		t.Fatalf("неожиданные сетевые счётчики: %+v", snapshot)
	}
	if len(interfaces) != 2 {
		t.Fatalf("неожиданный список интерфейсов: %v", interfaces)
	}
}