Implemented some basic tests for user repository

application/tests/Unit/Repository/UserRepositoryTest.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace tests\Unit\Repository;
+
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Doctrine\ORM\EntityManager;
+use App\Repository\UserRepository;
+use App\Entity\User;
+use App\Entity\UserInterface;
+
+class UserRepositoryTest extends KernelTestCase
+{
+    const USER_ID = 123456789;
+    /**
+     * @var EntityManager
+     */
+    protected $entityManager;
+
+    /**
+     * @var UserRepository
+     */
+    protected $userRepository;
+
+    public function setUp(): void
+    {
+        $kernel = self::bootKernel();
+        $this->entityManager = $kernel->getContainer()->get('doctrine')->getManager();
+        $this->userRepository = $this->entityManager->getRepository(User::class);
+    }
+
+    public function testCreation(): void
+    {
+        $user = new User();
+        $user->setId(self::USER_ID);
+        $this->entityManager->persist($user);
+        $this->entityManager->flush();
+        /**
+         * @var UserInterface
+         */
+        $loadedUser = $this->userRepository->find(self::USER_ID);
+        $this->assertEquals(self::USER_ID, $loadedUser->getId());
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see \Symfony\Bundle\FrameworkBundle\Test\KernelTestCase::tearDown()
+     */
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+        $this->entityManager->close();
+        $this->entityManager = null;
+    }
+}