fix tests and replace file_exists

tests/Models/CalendarMapperTest.php

@@ -24,6 +24,10 @@ use Modules\Calendar\Models\Event;
  */
 class CalendarMapperTest extends \PHPUnit\Framework\TestCase
 {
+    /**
+     * @covers Modules\Calendar\Models\CalendarMapper
+     * @group module
+     */
     public function testCRUD() : void
     {
         $calendar = new Calendar();

tests/Models/CalendarTest.php

@@ -22,6 +22,10 @@ use Modules\Calendar\Models\Event;
  */
 class CalendarTest extends \PHPUnit\Framework\TestCase
 {
+    /**
+     * @covers Modules\Calendar\Models\Calendar
+     * @group module
+     */
     public function testDefault() : void
     {
         $calendar = new Calendar();
@@ -37,6 +41,10 @@ class CalendarTest extends \PHPUnit\Framework\TestCase
         self::assertEquals([], $calendar->getEventByDate(new \DateTime('now')));
     }
 
+    /**
+     * @covers Modules\Calendar\Models\Calendar
+     * @group module
+     */
     public function testSetGet() : void
     {
         $calendar = new Calendar();

tests/Models/EventMapperTest.php

@@ -23,6 +23,10 @@ use Modules\Calendar\Models\EventMapper;
  */
 class EventMapperTest extends \PHPUnit\Framework\TestCase
 {
+    /**
+     * @covers Modules\Calendar\Models\EventMapper
+     * @group module
+     */
     public function testCRUD() : void
     {
         $calendarEvent1 = new Event();

tests/Models/EventTest.php

@@ -23,6 +23,10 @@ use Modules\Calendar\Models\Event;
  */
 class EventTest extends \PHPUnit\Framework\TestCase
 {
+    /**
+     * @covers Modules\Calendar\Models\Event
+     * @group module
+     */
     public function testDefault() : void
     {
         $event = new Event();
@@ -37,6 +41,10 @@ class EventTest extends \PHPUnit\Framework\TestCase
         self::assertInstanceOf('\phpOMS\Stdlib\Base\Location', $event->getLocation());
     }
 
+    /**
+     * @covers Modules\Calendar\Models\Event
+     * @group module
+     */
     public function testSetGet() : void
     {
         $event = new Event();