Code digger in Visual studio 2013

I am using vs 2013 and new to code digger. For the following code i had generated test data.

Code:

 public static int Test(int value)
    {
        if (value == 0)
        {
            return -1;
        }
        else if (value <= 10)
        {
            return 0;
        }
        else if (value <= 100)
        {
            return 1;
        }
        else
        {
            return 2;
        }
    }

Test data generated by code digger:

value result
  0     -1
  1     0
 11     1
 111    2

My actual doubt is, on what basis test data(value) has been generated by code digger to cover all paths. For an instance value 10 can also been used to get the result 0 but code digger generated 11.

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