add test for new setting

tst/ModelTest.php

@@ -452,6 +452,7 @@ class ModelTest extends TestCase
     public function testCommentWithDisabledVizhash()
     {
         $options                 = parse_ini_file(CONF, true);
+        $options['main']['discussiondatedisplay'] = 'false';
         $options['main']['icon'] = 'none';
         $options['model']        = array(
             'class' => 'Database',
@@ -493,6 +494,10 @@ class ModelTest extends TestCase
 
         $comment = current($this->_model->getPaste(Helper::getPasteId())->get()['comments']);
         $this->assertFalse(array_key_exists('icon', $comment['meta']), 'icon was not generated');
+        $this->assertTrue(array_key_exists('created', $comment['meta']), 'creation is set, when using default configuration');
+
+        $comment = current($paste->get()['comments']);
+        $this->assertFalse(array_key_exists('created', $comment['meta']), 'creation is not set, if using disabled configuration');
     }
 
     public function testCommentVizhash()