T = int(input())
for _ in range(T):
    N = int(input())
    A = list(map(int, input().split()))
    MOD = 1e9 + 7
    ans = 0
    for i in range(N-1):
        a = A.pop()
        b = A.pop()
        A.append((a*b+a+b) % MOD)
    print(int(A[0]))