public function testWarning()
 {
     $this->_ntf->warning('Warning test');
     $this->_ntf->warning('Warning test', true);
     $data = $this->_ntf->data;
     $this->assertCount(2, $data);
     $this->assertInstanceOf(Notification::class, $data[0]);
     $this->assertEquals('Тест предупреждения', $data[0]->message);
     $this->assertEquals(Notification::WARNING, $data[0]->type);
     $this->assertInstanceOf(Notification::class, $data[1]);
     $this->assertEquals('Warning test', $data[1]->message);
     $this->assertEquals(Notification::WARNING, $data[1]->type);
 }