EmptyStatementTest.php

<?php

namespace Drupal\Tests\Core\Database;

use Drupal\Core\Database\StatementEmpty;
use Drupal\Core\Database\StatementInterface;
use Drupal\Tests\UnitTestCase;

/**
 * Tests the empty pseudo-statement class.
 *
 * @group Database
 */
class EmptyStatementTest extends UnitTestCase {
    
    /**
     * Tests that the empty result set behaves as empty.
     */
    public function testEmpty() {
        $result = new StatementEmpty();
        $this->assertInstanceOf(StatementInterface::class, $result);
        $this->assertNull($result->fetchObject(), 'Null result returned.');
    }
    
    /**
     * Tests that the empty result set iterates safely.
     */
    public function testEmptyIteration() {
        $result = new StatementEmpty();
        $this->assertSame(0, iterator_count($result), 'Empty result set should not iterate.');
    }
    
    /**
     * Tests that the empty result set mass-fetches in an expected way.
     */
    public function testEmptyFetchAll() {
        $result = new StatementEmpty();
        $this->assertEquals($result->fetchAll(), [], 'Empty array returned from empty result set.');
    }

}