/**
  * @param string $topic
  * @param string $key
  * @param boolean $expected
  * @dataProvider providerExists
  * @depends testLoad
  */
 public function testExists($topic, $key, $expected = true)
 {
     $this->lexicon->load($topic);
     $exists = $this->lexicon->exists($key);
     $this->assertEquals($expected, $exists);
 }