feat: add second loose condition

src/game.zig

@@ -33,11 +33,14 @@ const Game = struct {
     body: std.ArrayList(Vec2),
     state: State,
 
-    pub fn create(allocator: std.mem.Allocator) !Game {
+    pub fn createWithSize(allocator: std.mem.Allocator, bodySize: u8) !Game {
         var body = try std.ArrayList(Vec2).initCapacity(allocator, 1000);
-        try body.append(Vec2{ 10, 10 });
-        try body.append(Vec2{ 9, 10 });
-        try body.append(Vec2{ 8, 10 });
+
+        const startPos: u8 = 10;
+        for (0..bodySize) |i| {
+            const index = std.math.cast(i32, i) orelse unreachable;
+            try body.append(Vec2{ startPos - index, 10 });
+        }
 
         return Game{
             .playFieldSize = Vec2{ 20, 20 },
@@ -48,6 +51,10 @@ const Game = struct {
         };
     }
 
+    pub fn create(allocator: std.mem.Allocator) !Game {
+        return createWithSize(allocator, 3);
+    }
+
     pub fn deinit(self: *Game) void {
         self.body.deinit();
     }
@@ -79,6 +86,14 @@ const Game = struct {
             self.state = State.lost;
             return;
         }
+
+        for (self.body.items) |pos| {
+            if (std.meta.eql(pos, newHead)) {
+                self.state = State.lost;
+                return;
+            }
+        }
+
         try self.body.insert(0, newHead);
         _ = self.body.pop();
     }
@@ -138,7 +153,27 @@ test "should loose if exiting playField right" {
     try testing.expectEqual(State.lost, game.state);
 }
 
-test "should loose if eating itself" {}
+test "should loose if touching tail" {
+    const allocator = testing.allocator;
+
+    var game = try Game.createWithSize(allocator, 4);
+    defer game.deinit();
+
+    game.setDirection(Direction.down);
+    try game.tick();
+    game.setDirection(Direction.left);
+    try game.tick();
+    try testing.expectEqual(State.running, game.state);
+    game.setDirection(Direction.up);
+    try game.tick();
+    try testing.expectEqual(State.lost, game.state);
+
+    const expected = [_]Vec2{ Vec2{ 9, 11 }, Vec2{ 10, 11 }, Vec2{ 10, 10 }, Vec2{ 9, 10 } };
+    try testing.expectEqualSlices(Vec2, &expected, game.body.items);
+
+    try testing.expectEqual(State.lost, game.state);
+}
+
 test "should grow if eating food" {}
 test "should win if no space is left" {}
 test "should tick if running" {}