public function statementProvider()
 {
     return array('minimal-statement' => array(StatementJsonFixtures::getMinimalStatement(), StatementFixtures::getMinimalStatement()), 'statement-reference' => array(StatementJsonFixtures::getStatementWithStatementRef(), StatementFixtures::getStatementWithStatementRef()), 'statement-with-sub-statement' => array(StatementJsonFixtures::getStatementWithSubStatement(), StatementFixtures::getStatementWithSubStatement()), 'statement-with-result' => array(StatementJsonFixtures::getStatementWithResult(), StatementFixtures::getStatementWithResult()), 'statement-with-agent-authority' => array(StatementJsonFixtures::getStatementWithAgentAuthority(), StatementFixtures::getStatementWithAgentAuthority()), 'statement-with-group-authority' => array(StatementJsonFixtures::getStatementWithGroupAuthority(), StatementFixtures::getStatementWithGroupAuthority()));
 }