function testSqlLiteral()
{
$sqlLiteral = Sirel::sql('COUNT(id)');
$this->assertInstanceOf('\\Sirel\\Node\\SqlLiteral', $sqlLiteral);
$this->assertEquals('COUNT(id)', $sqlLiteral->expression);
}
function testDeleteAll()
{
$users = new Table("users");
$rowsDeleted = $this->pdo->exec($users->delete()->toSql());
$this->assertEquals(3, $rowsDeleted);
$row = $this->pdo->query($users->project(Sirel::sql('COUNT(\'id\') AS count')))->fetch();
$this->assertEquals(0, $row['count']);
}