//rule 2 - Any live cell with two or three live neighbours
//lives.
public void RemainAliveTest()
{
GameOfLife test = new GameOfLife(3, 3);
test.grid[1, 1] = true;
test.grid[1, 0] = true;
test.grid[2, 0] = true;
Assert.IsTrue(test.RemainAlive(1, 1));
//another way of testing the same thing
Assert.AreEqual(test.grid[1, 1], test.RemainAlive(1, 1));
}