diff --git a/api/tests/unit/Repositories/WorkingHoursViewRepositoryTest.php b/api/tests/unit/Repositories/WorkingHoursViewRepositoryTest.php
index 12d71b2..a78e106 100644
--- a/api/tests/unit/Repositories/WorkingHoursViewRepositoryTest.php
+++ b/api/tests/unit/Repositories/WorkingHoursViewRepositoryTest.php
@@ -3,6 +3,8 @@
 namespace TorstenHettstedt\TimekeepingApi\Tests\Unit\Repositories;
 
 use Codeception\Test\Unit;
+use DateTime;
+use DateTimeZone;
 use PDO;
 use TorstenHettstedt\TimekeepingApi\Models\WorkingHoursView;
 use TorstenHettstedt\TimekeepingApi\Repositories\RepositoryRecordNotFoundException;
@@ -12,16 +14,11 @@ use TorstenHettstedt\TimekeepingApi\Repositories\WorkingHoursYearlyViewRepositor
 
 class WorkingHoursViewRepositoryTest extends Unit
 {
-    const EXISTING_DATE     = '2020-01-28';
-    const EXISTING_INTERVAL = 'PT7H20M';
-    const NEW_DATE          = '2020-04-01';
-    const NEW_INTERVAL      = 'PT7H59M';
-    const RECORDS_COUNT     = 61;
-
     protected PDO          $pdoObject;
 
     protected function _before(): void
     {
+        /** @noinspection SpellCheckingInspection */
         $this->pdoObject = new PDO('pgsql:host=psql.torsten-hettstedt.net;port=5432;dbname=testdb;user=bruce;password=mypass');
         parent::_before();
     }
@@ -44,9 +41,9 @@ class WorkingHoursViewRepositoryTest extends Unit
     public function existingObjectProvider(): array
     {
         return [
-            [WorkingHoursYearlyViewRepository::class,  '2020',    61],
-            [WorkingHoursMonthlyViewRepository::class, '2020 February', 20],
-            [WorkingHoursWeeklyViewRepository::class,  '2020#03',   5],
+            [WorkingHoursYearlyViewRepository::class,  '2020',          61, new DateTime('2020-01-01', new DateTimeZone('UCT'))],
+            [WorkingHoursMonthlyViewRepository::class, '2020 February', 20, new DateTime('2020-02-01', new DateTimeZone('UCT'))],
+            [WorkingHoursWeeklyViewRepository::class,  '2020#03',        5, new DateTime('2020-01-13', new DateTimeZone('UCT'))],
         ];
     }
 
@@ -81,16 +78,18 @@ class WorkingHoursViewRepositoryTest extends Unit
      *
      * @dataProvider existingObjectProvider
      *
-     * @param string $period_class
-     * @param string $search
-     * @param int    $workingDays
+     * @param string   $period_class
+     * @param string   $search
+     * @param int      $workingDays
+     * @param DateTime $period
      */
-    public function testExistingFindByKey(string $period_class, string $search, int $workingDays): void
+    public function testExistingFindByKey(string $period_class, string $search, int $workingDays, DateTime $period): void
     {
         $repository = new $period_class($this->pdoObject);
         $model = $repository->findByKey($search);
         $this->assertInstanceOf(WorkingHoursView::class, $model);
         $this->assertEquals($workingDays, $model->getWorkingDays());
+        $this->assertEquals($period->format('Ymd'), $model->getPeriod()->format('Ymd'));
     }
 
     /**