import java.util.Scanner;
class Solution
{
	public static void main(String[]args)
	{
		Scanner s=new Scanner(System.in);
		int n=s.nextInt();
		for(int i=0;i<n;i++)
		{
			int total=0,count=0;
			int p=s.nextInt();
			int q=s.nextInt();
			int []a=new int[p];
			for(int j=0;j<p;j++)
			{
				a[j]=s.nextInt();
			}
			for(int j=0;j<p;j++)
			{
				if(total+a[j]<=q)
				{
					total+=a[j];
					count++;
				}
				else
				{
					break;
				}
			}
			System.out.println(count);
			count=0;
 
		}
	}
}

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Mwo0IDEwCjUgMiA1IDIKNCA1CjIgMSAxIDEKMyAxMAoxMSAxIDEK

3
4 10
5 2 5 2
4 5
2 1 1 1
3 10
11 1 1