public void TargetExists()
{
Grid g = new Grid(16, 16);
Snake s = new Snake(g, g[8, 8], 2, Direction.Right);
SnakeMover sm = new SnakeMover(s, 4);
Assert.AreEqual(s, sm.Target, "SnakeMover.Target should correspond to the first constructor parameter.");
}
public void TickingMotion()
{
Grid g = new Grid(16, 16);
Snake s = new Snake(g, g[8, 8], 2, Direction.Right);
Timer t = new Timer(1000);
SnakeMover sm = new SnakeMover(s, 4);
t.Elapsed += (object sender, ElapsedEventArgs e) => {
t.Stop();
sm.Dispose();
Assert.AreEqual(g[12, 8], s.Head.Cell, "A SnakeMover set to tick 4 times per second should move the snake 4 times per second.");
Assert.AreEqual(Direction.Right, s.Head.MovementDirection, "A SnakeMover should not by itself change the snake's direction.");
};
t.Start();
}
public void Events()
{
Grid g = new Grid(16, 16);
Cell c = g[8, 8];
Snake s = new Snake(g, c, 2, Direction.Up);
SnakeMover sm = new SnakeMover(s, 4);
sm.BeforeMove += (object sender, EventArgs e) =>
{
Assert.AreEqual(c, s.Head, "When SnakeMover.BeforeMove fires, the snake's head should be in the position it was before movement.");
};
sm.AfterMove += (object sender, EventArgs e) =>
{
Assert.AreEqual(g[7, 8], s.Head, "When SnakeMover.AfterMove fires, the snake's head should be in its new position.");
};
sm.Dispose();
s = new Snake(g, g[1, 0], 2, Direction.Left);
sm = new SnakeMover(s, 4);
int ticks = 0;
sm.BeforeMove += (object sender, EventArgs e) =>
{
if (++ticks > 2)
{
Assert.Fail("SnakeMover.OutOfBounds did not fire at the correct time (too many ticks elapsed).");
}
};
sm.OutOfBounds += (object sender, EventArgs e) =>
{
if (ticks < 2)
{
Assert.Fail("SnakeMover.OutOfBounds did not fire at the correct time (too early).");
}
else
{
Assert.Pass();
}
};
}