/**
  * @param string $expected
  * @param string $namespace
  * @param string $topic
  * @param string $language
  * @dataProvider providerGetCacheKey
  */
 public function testGetCacheKey($expected, $namespace, $topic, $language)
 {
     $key = $this->lexicon->getCacheKey($namespace, $topic, $language);
     $this->assertEquals($expected, $key);
 }