Solve the programming task below in a Python markdown code block.
Monk visits the land of Islands.  There are a total of N islands numbered from 1 to N.  Some pairs of islands are connected to each other by Bidirectional bridges running over water.
Monk hates to cross these bridges as they require a lot of efforts. He is standing at Island #1 and wants to reach the Island #N. Find the minimum the number of bridges that he shall have to cross, if he takes the optimal route.   

Input:
First line contains T. T testcases follow.
First line of each test case contains two space-separated integers N, M.
Each of the next M lines contains two space-separated integers X and Y , denoting that there is a bridge between Island X and Island Y.  

Output:
Print the answer to each test case in a new line.

Constraints:
1 ≤ T ≤ 10
1 ≤ N ≤ 10^4
1 ≤ M ≤ 10^5
1 ≤ X, Y ≤ N

SAMPLE INPUT
2
3 2
1 2
2 3
4 4
1 2
2 3
3 4
4 2

SAMPLE OUTPUT
2
2