public function testSignatureWithAccessSecretIsConsumerAndAccessSecretStringsConcatWithAmp()
{
$params = array(
'oauth_version' => '1.0',
'oauth_consumer_key' => 'dpf43f3p2l4k3l03',
'oauth_signature_method' => 'PLAINTEXT',
'oauth_timestamp' => '1191242090',
'oauth_nonce' => 'hsu94j3884jdopsl',
'oauth_version' => '1.0'
);
$signature = new Signature\Plaintext('1234567890', '0987654321');
$this->assertEquals('1234567890&0987654321', $signature->sign($params));
}