public void TestCheckValid()
{
Rover rover = new Rover();
rover.SetPosition(39, 20);
Boolean result = rover.CheckValid(50, 50);
Assert.AreEqual(false, result);
result = rover.CheckValid(5, 5);
Assert.AreEqual(true, result);
result = rover.CheckValid(39, 20);
Assert.AreEqual(false, result);
result = rover.CheckValid(39, 40);
Assert.AreEqual(false, result);
result = rover.CheckValid(25, 20);
Assert.AreEqual(true, result);
}