public function testCanGetALongLivedAccessTokenFromShortLivedOne()
{
$response = m::mock('Psr\\Http\\Message\\ResponseInterface');
$response->shouldReceive('getHeader')->times(1)->andReturn('application/json');
$response->shouldReceive('getBody')->times(1)->andReturn('{"access_token":"long-lived-token","token_type":"bearer","expires_in":3600}');
$client = m::mock('GuzzleHttp\\ClientInterface');
$client->shouldReceive('send')->times(1)->andReturn($response);
$this->provider->setHttpClient($client);
$token = $this->provider->getLongLivedAccessToken('short-lived-token');
$this->assertEquals('long-lived-token', $token->getToken());
}
