def solve(N,S):
    cnt = 0
    for i in range(1,N):
        for j in range(N):
            if j < i and i + j < N:
                if S[j] < S[i+j]:
                    cnt += 1
                    break
                if S[j] > S[i+j]:
                    break
            elif j == i and i + j < N:
                cnt += 1
                break
            elif j < i and i + j == N:
                break
    return cnt

T = int(input())
for t in range(T):
    N = int(input())
    S = input()
    print(solve(N,S))