public function testGetAccessTokenUnit()
{
$config = array('mode' => 'sandbox', 'cache.enabled' => true, 'cache.FileName' => AuthorizationCacheTest::CACHE_FILE);
$cred = new OAuthTokenCredential('clientId', 'clientSecret');
//{"clientId":{"clientId":"clientId","accessToken":"accessToken","tokenCreateTime":1421204091,"tokenExpiresIn":288000000}}
AuthorizationCache::push($config, 'clientId', $cred->encrypt('accessToken'), 1421204091, 288000000);
$apiContext = new ApiContext($cred);
$apiContext->setConfig($config);
$this->assertEquals('clientId', $cred->getClientId());
$this->assertEquals('clientSecret', $cred->getClientSecret());
$result = $cred->getAccessToken($config);
$this->assertNotNull($result);
}