num_cases = int(input())
ans = [0]*num_cases
for i in range(num_cases):
    num_bulbs = int(input())
    bulbs_str = input()
    j=0
    while j < num_bulbs:
        if bulbs_str[j] =='.':
            j+=3
            ans[i]+=1
        else:
            j+=1
for i in ans:
    print(i)