do not allow to stop already stopped timesheets (#289)

tests/Repository/AbstractRepositoryTest.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Repository;
+
+use App\Tests\KernelTestTrait;
+use Doctrine\ORM\EntityManager;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * A base test class for AbstractRepository implementations.
+ */
+abstract class AbstractRepositoryTest extends KernelTestCase
+{
+    use KernelTestTrait;
+
+    /**
+     * @var EntityManager
+     */
+    private $entityManager;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp()
+    {
+        $kernel = self::bootKernel();
+
+        $this->entityManager = $kernel->getContainer()
+            ->get('doctrine')
+            ->getManager();
+    }
+
+    /**
+     * @return EntityManager
+     */
+    protected function getEntityManager()
+    {
+        return $this->entityManager;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function tearDown()
+    {
+        parent::tearDown();
+
+        $this->entityManager->close();
+        $this->entityManager = null; // avoid memory leaks
+    }
+}