public void TestRiver2()
{
int[,] matrix = { { 1, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0 } };
int[] expected = { 5 };
var rivers = new Rivers();
var received = rivers.Solve(matrix);
Assert.AreEqual(expected.Length, received.Length);
}