function test_getPlayableUrl()
{
$doc = $this->make_enclosure_audio(null, null);
$this->assertNull(SDKWrapper::getPlayableUrl($doc));
// valid file extension
$doc = $this->make_enclosure_audio('http://foobar.gov/mp3.mp3');
$this->assertEquals('http://foobar.gov/mp3.mp3', SDKWrapper::getPlayableUrl($doc));
// invalid file extension
$doc = $this->make_enclosure_audio('http://foobar.gov/mp3.jpg');
$this->assertNull(SDKWrapper::getPlayableUrl($doc));
// invalid extension, but valid type
$doc = $this->make_enclosure_audio('http://foobar.gov/mp3.jpg', 'audio/mpeg');
$this->assertEquals('http://foobar.gov/mp3.jpg', SDKWrapper::getPlayableUrl($doc));
// invalid extension and type
$doc = $this->make_enclosure_audio('http://foobar.gov/something', 'image/jpeg');
$this->assertNull(SDKWrapper::getPlayableUrl($doc));
// dereference m3u
$doc = $this->make_enclosure_audio('http://api.npr.org/m3u/1450294957-2eb257.m3u');
$this->assertRegexp('/\\.mp3$/', SDKWrapper::getPlayableUrl($doc));
}
