Create todos with an ID

src/Todo.php

@@ -13,15 +13,22 @@ class Todo
     private string $title;
     private string $state;
     private bool $important;
+    private int $id;
 
     public function __construct(string $title, bool $important = false)
     {
         $this->validateTitle($title);
+        $this->id = IdManager::generateID(self::class);
         $this->title = $title;
         $this->state = TodoStates::Todo;
         $this->important = $important;
     }
 
+    public function getID(): int
+    {
+        return $this->id;
+    }
+
     public function getTitle(): string
     {
         return $this->title;

tests/TodoTest.php

@@ -6,7 +6,17 @@ use PHPUnit\Framework\TestCase;
 
 class TodoTest extends TestCase
 {
-    public function testCreateTodo(): void
+    public function testCreateTodo(): void {
+        $todo1 = new Todo("Some title");
+        $todo2 = new Todo("Some title");
+        $this->assertNotEquals(
+            $todo1->getID(),
+            $todo2->getID(),
+            "Expected todos to have different UIDs but they have the same."
+        );
+    }
+
+    public function testTodoHasTitle(): void
     {
         $title = "Some task";
         $todo = new Todo($title);