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Detect cycle in an undirected graph (Function Problem)

Given a undirected graph  your task is to complete the method isCycle  to detect if there is a cycle in the undirected graph or not. You should not read any input from stdin/console.
There are multiple test cases. For each test case, this method will be called individually.


Input (only to be used for Expected Output):
The first line of the input contains an integer 'T' denoting the number of test cases. Then 'T' test cases follow. Each test case consists of two lines. 
Description of  test cases is as follows:
The First line of each test case contains two integers 'N' and 'M'  which denotes the no of vertices and no of edges respectively.
The Second line of each test case contains 'M'  space separated pairs u and v denoting that there is a bidirectional  edge from u to v .

The method should return true if there is a cycle else it should return false.

1 <=T<= 100
0 <=u,v<= N-1


2 2
0 1 0 0
4 3
0 1 1 2 2 3


In above first test case there is a graph with 2 vertices and 2 edges the first edge is from 0 to 1 and other edge is from 0 to 0 . 
In the second test case there is a graph with 3 vertices and 3 edges from 0 to 1 , 1 to 2 and 2 to 3

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Amit Khandelwal, Harshit Sidhwa

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