$this->assertTrue( in_array( 'rev_id', $fields ), 'missing rev_id in list of fields' );
$this->assertTrue( in_array( 'rev_page', $fields ), 'missing rev_page in list of fields' );
$this->assertTrue( in_array( 'rev_id', $fields ), 'missing rev_id in list of fields' );
$this->assertTrue( in_array( 'rev_page', $fields ), 'missing rev_page in list of fields' );