public function testGetArtists()
 {
     $artists = array('6v8FB84lnmJs434UJf2Mrm', '6olE6TJLqED3rqDCT0FyPh');
     $expected = array('ids' => '6v8FB84lnmJs434UJf2Mrm,6olE6TJLqED3rqDCT0FyPh');
     $headers = array('Authorization' => 'Bearer ' . $this->accessToken);
     $return = array('body' => get_fixture('artists'));
     $stub = $this->setupStub('GET', '/v1/artists/', $expected, $headers, $return);
     $api = new SpotifyWebAPI\SpotifyWebAPI($stub);
     $api->setAccessToken($this->accessToken);
     $response = $api->getArtists($artists);
     $this->assertNotEmpty($response->artists);
 }