Implemented a few basic tests and ideas for future ones

src/infrastructure/road_manager.zig

@@ -51,4 +51,44 @@ pub const RoadManager = struct {
         self.roads.clearRetainingCapacity();
         self.next_id = 0;
     }
-};
+};
+
+const Vector2 = @import("raylib").Vector2;
+const expect = std.testing.expect;
+
+test "id tracking" {
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    var road_man: RoadManager = .init();
+    defer road_man.deinit(allocator);
+    const n = 5;
+
+    const start: Node = .init(0, .{.x = 0, .y = 0});
+    const start_ptr = try allocator.create(Node);
+    start_ptr.* = start;
+
+    const end: Node = .init(1, .{.x = 100, .y = 100});
+    const end_ptr = try allocator.create(Node);
+    end_ptr.* = end;
+
+    defer {
+        start_ptr.deinit(allocator);
+        end_ptr.deinit(allocator);
+
+        allocator.destroy(start_ptr);
+        allocator.destroy(end_ptr);
+    }
+
+    for (0..n) |_| {
+        try road_man.addRoad(allocator, start_ptr, end_ptr);
+    }
+
+    try expect(road_man.next_id == n);
+    try expect(road_man.roads.items.len == n);
+}
+
+// TODO tests
+// force resize pointer test
+// destroy road and then verify the nodes do not have a pointer to it