public function testSignatureWithNULLAccessSecretIsOnlyConsumerSecretString()
{
$params = array('oauth_version' => '1.0', 'oauth_consumer_key' => 'dpf43f3p2l4k3l03', 'oauth_signature_method' => 'PLAINTEXT', 'oauth_timestamp' => '1191242090', 'oauth_nonce' => 'hsu94j3884jdopsl');
$signature = new Signature\Plaintext('1234567890', null);
$this->assertEquals('1234567890&', $signature->sign($params));
}
