Create todos with an ID

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);