Added ID manager

src/IdManager.php

@@ -4,5 +4,24 @@ namespace MMK2410\MyTodoList;
 
 class IdManager
 {
+    private static array $ids = array();
 
+    public static function generateID(string $classname): int
+    {
+        if (!array_key_exists($classname, self::$ids)) {
+            self::$ids[$classname] = 0;
+            return 0;
+        } else {
+            return ++self::$ids[$classname];
+        }
+    }
+
+    public static function getCurrentId(string $classname)
+    {
+        if (!array_key_exists($classname, self::$ids)) {
+            return 0;
+        } else {
+            return self::$ids[$classname];
+        }
+    }
 }

tests/IdManagerTest.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 
 use MMK2410\MyTodoList\IdManager;
@@ -6,5 +6,27 @@ use PHPUnit\Framework\TestCase;
 
 class IdManagerTest extends TestCase
 {
-
+    public function testGenerateTwoIds(): void
+    {
+        $id1 = IdManager::generateID(IdManagerTest::class . "::testGenerateTwoIds");
+        $id2 = IdManager::generateID(IdManagerTest::class . "::testGenerateTwoIds");
+        self::assertNotEquals(
+            $id1,
+            $id2,
+            "ID 1 '$id1' and ID 2 '$id2' are equal, but the shouldn't."
+        );
+    }
+
+    public function testGetCurrentId(): void
+    {
+        for ($i = 0; $i < 3; $i++) {
+            IdManager::generateID(IdManagerTest::class . "::testGetCurrentId()");
+        }
+        $currentId = IdManager::getCurrentId(IdManagerTest::class . "::testGetCurrentId()");
+        self::assertEquals(
+            2,
+            $currentId,
+            "Expected current ID to be '2', but got '$currentId'"
+        );
+    }
 }