Test range queries. The SQL clause varies with the database.
function testRange() {
$query = db_select('test');
$name_field = $query
->addField('test', 'name');
$age_field = $query
->addField('test', 'age', 'age');
$query
->range(0, 2);
$result = $query
->execute();
$num_records = 0;
foreach ($result as $record) {
$num_records++;
}
$this
->assertEqual($num_records, 2, 'Returned the correct number of rows.');
}