#include <cstdio>
#include <cstring>
#include <queue>
#define LL long long
#define lowbit(x) ((x) & (-x))
const int MAXN = 10;
const int INF = 0x3f3f3f3f;
const int dir[][2] = { {-1, 0}, {1, 0}, {0, -1}, {0, 1} };
using namespace std;
 
struct POINT
{
    int x, y, dis;
    int xlast, ylast;
};
 
int mp[MAXN][MAXN], vis[MAXN][MAXN][4], row, col, cVis[MAXN][MAXN];
queue<POINT> qu;
int st, ed;
POINT boxSt, peo;
 
bool Check(int x, int y, int xcur, int ycur)
{
    if (x == st && y == ed)
        return true;
    cVis[x][y] = 1;
    for (int i = 0; i < 4; i++)
    {
        int xx = x + dir[i][0], yy = y + dir[i][1];
        if (xx >= 1 && xx <= row && yy >= 1 && yy <= col && !cVis[xx][yy] && mp[xx][yy] != 1 && !(xx == xcur && yy == ycur))
            if (Check(xx, yy, xcur, ycur))
                return true;
    }
    return false;
}
 
int BFS(POINT boxSt)
{
    bool first = true;
    memset(vis, 0, sizeof vis);
    while (!qu.empty())
        qu.pop();
    qu.push(boxSt);
    while (!qu.empty())
    {
        POINT cur = qu.front(); qu.pop();
        if (mp[cur.x][cur.y] == 3)                       
            return cur.dis;
        for (int i = 0; i < 4; i++)  //0, 1, 2, 3, up, down, left, right
        {
            int x = cur.x + dir[i][0], y = cur.y + dir[i][1];
            if (mp[x][y] != 1 && x >= 1 && x <= row && y >= 1 && y <= col && !vis[x][y][i])
            {
                st = cur.x - dir[i][0], ed = cur.y - dir[i][1];
                memset(cVis, 0, sizeof cVis);
                cVis[peo.x][peo.y] = 1;
                POINT temp; temp.x = x, temp.y = y, temp.dis = cur.dis + 1;
                temp.xlast = cur.x, temp.ylast = cur.y;
                if (Check(cur.xlast, cur.ylast, cur.x, cur.y))
                {
                    vis[x][y][i] = 1;
                    qu.push(temp);
                }
            }
        }
    }
    return -1;
}
 
int main()
{
    //freopen("input.txt", "r", stdin);
    int i, j, T;
    scanf("%d", &T);
    while (T--)
    {
        boxSt.dis = 0;
        scanf("%d%d", &row, &col);
        for (i = 1; i <= row; i++)
            for (j = 1; j <= col; j++)
            {
                scanf("%d", ∓[i][j]);
                if (mp[i][j] == 2)
                    boxSt.x = i, boxSt.y = j;
                if (mp[i][j] == 4)
                    boxSt.xlast = i, boxSt.ylast = j;
            }
            printf("%d\n", BFS(boxSt));
    }
    return 0;
}