Confirm that range query work and return correct result.
function testRangeQuery() {
// Test if return correct number of rows.
$range_rows = db_query_range("SELECT name FROM {system} ORDER BY name", 2, 3)
->fetchAll();
$this
->assertEqual(count($range_rows), 3, 'Range query work and return correct number of rows.');
// Test if return target data.
$raw_rows = db_query('SELECT name FROM {system} ORDER BY name')
->fetchAll();
$raw_rows = array_slice($raw_rows, 2, 3);
$this
->assertEqual($range_rows, $raw_rows, 'Range query work and return target data.');
}