removeAddedDefaultDomains example

#[Package('core')] class Migration1620820321AddDefaultDomainForHeadlessSaleschannelTest extends TestCase
{
    use IntegrationTestBehaviour;

    private Connection $connection;

    protected function setUp(): void
    {
        $this->connection = $this->getContainer()->get(Connection::class);
        $this->removeAddedDefaultDomains();
    }

    protected function tearDown(): void
    {
        $this->removeAddedDefaultDomains();
        $this->removeAddedSalesChannel();
    }

    public function testItAddsDefaultDomainToHeadlessSalesChannel(): void
    {
        $statement = $this->connection->prepare('SELECT COUNT(*) FROM `sales_channel_domain` WHERE `sales_channel_id` = :salesChannelId');