public function testMyTracksContains()
 {
     $tracks = array('1id6H6vcwSB9GGv9NXh5cl', '3mqRLlD9j92BBv1ueFhJ1l');
     $expected = array('ids' => '1id6H6vcwSB9GGv9NXh5cl,3mqRLlD9j92BBv1ueFhJ1l');
     $headers = array('Authorization' => 'Bearer ' . $this->accessToken);
     $return = array('body' => get_fixture('user-tracks-contains'));
     $stub = $this->setupStub('GET', '/v1/me/tracks/contains', $expected, $headers, $return);
     $api = new SpotifyWebAPI\SpotifyWebAPI($stub);
     $api->setAccessToken($this->accessToken);
     $response = $api->myTracksContains($tracks);
     $this->assertTrue($response[0]);
 }