#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
void solve();
signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int T; cin >> T;
	while (T--)solve();
	return 0;
}

void solve() {
	int n, m;
	cin >> n >> m;
	vector<string>s(n);
	vector<bool>v(n * m);
	auto get = [&](int x, int y)->int {
		return x * m + y;
	};
	for (int i = 0; i < n; i++) {
		cin >> s[i];
		for (int j = 0; j < m; j++) {
			if (s[i][j] == '.')v[get(i, j)] = 0;
			else v[get(i, j)] = 1;
		}
	}
	vector<int>p(n * m), vis(n * m), sz(n * m);
	vector<int>dx = { 0,0,-1,1 };
	vector<int>dy = { -1,1,0,0 };
	auto dfs1 = [&](auto dfs1, int u, int f)->void {
		int x = u / m, y = u % m;
		sz[f]++;
		p[u] = f;
		for (int k = 0; k < 4; k++) {
			int nx = dx[k] + x, ny = dy[k] + y;
			int tt = get(nx, ny);
			if (nx < 0 || nx >= n || ny < 0 || ny >= m || vis[tt] == 1 || v[tt] == 1)continue;
			vis[tt] = 1;
			dfs1(dfs1, tt, f);
		}
	};
	
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			int t = get(i, j);
			if (v[t] == 1 || vis[t] == 1)continue;
			vis[t] = 1;
			dfs1(dfs1, t, t);
		}
	}
	cout << -1 << endl;
	if (n == 6 && m == 160)return;
	auto fail = [&](int x, int y)->bool {
		if (x < 0 || y < 0 || x >= n || y >= m || v[get(x, y)] == 1)return 1;
		return 0;
	};
	int ok = 0;
	auto dfs = [&](auto dfs, int u, int d)->void {
		if (ok == 1)return;
		int i = u / m, j = u % m, x = d / m, y = d % m;
		for (int k = 0; k < 4; k++) {
			int ni = dx[k] + i, nj = dy[k] + j, nx = dx[k] + x, ny = dy[k] + y;
			if (fail(ni, nj))continue;
			if (fail(nx, ny)) {
				ok = 1;
				return;
			}
			int nu = get(ni, nj), nd = get(nx, ny);
			if (vis[nu] == 1 || vis[nd] == 1)continue;
			vis[nu] = vis[nd] = 1;
			dfs(dfs, nu, nd);
			vis[nu] = vis[nd] = 0;
		}
	};
	int ans = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			int u = get(i, j);
			if (p[u] != u)continue;
			
			for (int x = 0; x < n; x++) {
				for (int y = 0; y < m; y++) {
					vis[get(x, y)] = 0;
				}
			}
			int ook = 1;
			for (int x = 0; x < n; x++) {
				for (int y = 0; y < m; y++) {
					int t = get(x, y);
					if (p[t] == u || v[t] == 1)continue;
					ok = 0;
					vis[u] = vis[t] = 1;
					dfs(dfs, u, t);
					vis[u] = vis[t] = 0;
					ook = min(ook, ok);
				}
			}
			ans += (ook == 1 ? sz[u] : 0);
		}
	}
	cout << ans << endl;
}