#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
 
ll dp[300005][3];
int c[300005][3];
vector<int> a;
vector<int> b;
int cnt;
 
ll solve(int idx, ll val) {
	cout<<idx<<" "<<val<<endl;
	if (idx == a.size() - 1) return 0;
	if (val - a[idx] > 2) return 1LL << 60;
	if (c[idx][val - a[idx]] == cnt) return dp[idx][val - a[idx]];
 
	dp[idx][val - a[idx]] = cnt;
 
	if (val == a[idx + 1]) {
		return dp[idx][val - a[idx]] = min(solve(idx + 1, a[idx+1]) + b[idx], solve( idx + 1, a[idx+ 1] + 1) + b[idx + 1]);
	}
 
	return dp[idx][val-a[idx]] = solve( idx + 1, a[idx + 1]);
}
 
int main()
{
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	int q; cin >> q;
	memset(dp, -1LL, sizeof(dp));
	while (q--)
	{
		int n; cin >> n;
		b.resize(n);
		a.resize(n);
		cnt++;
 
		for (int i = 0; i < n; i++) {
			cin >> a[i] >> b[i];
		}
 
		cout << solve(0, a[0]) << '\n';
 
	}
 
	return 0;
}
 

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MwozCjIgNAoyIDEKMyA1CjMKMiAzCjIgMTAKMiA2CjQKMSA3CjMgMwoyIDYKMTAwMDAwMDAwMCAyCg==

3
3
2 4
2 1
3 5
3
2 3
2 10
2 6
4
1 7
3 3
2 6
1000000000 2