LimitExpressionTest.php

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<?php
namespace Magento\Framework\DB\Test\Unit\Sql;

class LimitExpressionTest extends \PHPUnit\Framework\TestCase
{
    public function testToStringExceptionCount()
    {
        $sql = 'test sql';
        $count = 0;
        $model = new \Magento\Framework\DB\Sql\LimitExpression($sql, $count);
        $model->__toString();
    }

    public function testToStringExceptionOffset()
    {
        $sql = 'test sql';
        $count = 1;
        $offset = -1;
        $model = new \Magento\Framework\DB\Sql\LimitExpression($sql, $count, $offset);
        $model->__toString();
    }

    public function testToString()
    {
        $sql = 'select * from test_table';
        $count = 1;
        $offset = 1;
        $model = new \Magento\Framework\DB\Sql\LimitExpression($sql, $count, $offset);
        $this->assertEquals('select * from test_table LIMIT 1 OFFSET 1', $model->__toString());
    }
}