// compile: g++ -o data data.cpp -O3 -std=gnu++20 -Wall -Wextra -Wshadow -D_GLIBCXX_ASSERTIONS -ggdb3 -fmax-errors=2 -DLOCAL
// run: ./data < data.in
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef LOCAL
#include <debug/codeforces.h>
#define debug(x...) {_variables(#x);_print(x);}
#else
#define debug(x...)
#endif
template<typename...Args> void print_(Args...args){((cout<<args<<" "),...)<<endl;}
#define rep(i,a,b) for(int i=(a);i<(int)(b);++i)
#define sz(v) ((int)(v).size())
#define print(...) print_(__VA_ARGS__);
#define INTMAX (int)(9223372036854775807)
#define INTINF (int)(1152921504606846976)
#define int long long
#define MAXN 200010



int32_t main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

    int _; cin >> _;
    while (_--) {
        int n, m; cin >> n >> m;
        vector<int> d(n);
        rep(i, 0, m) {
            int x, y; cin >> x >> y;
            ++d[x-1], ++d[y-1];
        }
        int da = -1, sa = 0, db = -1, sb = 0;
        rep(i, 0, n) {
            if (d[i] == 1) continue;
            if (!~da) da = d[i], ++sa;
            else if (da == d[i]) ++sa;
            else if (!~db) db = d[i], ++sb;
            else if (db == d[i]) ++sb;
        }
        if (!~db) cout << da << " " << da-1 << endl;
        else {
            if (sb == 1) swap(da, db);
            cout << da << " " << db-1 << endl;
        }
    }

    return 0;
}