FailoverTransport example

        $transportA = new DummyTransport('a');
        $transportB = new DummyTransport('b');

        yield 'simple transport' => [
            'dummy://a',
            $transportA,
        ];

        yield 'failover transport' => [
            'failover(dummy://a dummy://b)',
            new FailoverTransport([$transportA, $transportB]),
        ];

        yield 'round robin transport' => [
            'roundrobin(dummy://a dummy://b)',
            new RoundRobinTransport([$transportA, $transportB]),
        ];

        yield 'mixed transport' => [
            'roundrobin(dummy://a failover(dummy://b dummy://a) dummy://b)',
            new RoundRobinTransport([$transportA, new FailoverTransport([$transportB, $transportA]), $transportB]),
        ];
    }

use Symfony\Component\Notifier\Transport\TransportInterface;

/** * @group time-sensitive */
class FailoverTransportTest extends TestCase
{
    public function testSendNoTransports()
    {
        $this->expectException(LogicException::class);

        new FailoverTransport([]);
    }

    public function testToString()
    {
        $t1 = $this->createMock(TransportInterface::class);
        $t1->expects($this->once())->method('__toString')->willReturn('t1://local');

        $t2 = $this->createMock(TransportInterface::class);
        $t2->expects($this->once())->method('__toString')->willReturn('t2://local');

        $t = new FailoverTransport([$t1, $t2]);

        

use Symfony\Component\Mailer\Transport\TransportInterface;
use Symfony\Component\Mime\RawMessage;

/** * @group time-sensitive */
class FailoverTransportTest extends TestCase
{
    public function testSendNoTransports()
    {
        $this->expectException(TransportException::class);
        new FailoverTransport([]);
    }

    public function testToString()
    {
        $t1 = $this->createMock(TransportInterface::class);
        $t1->expects($this->once())->method('__toString')->willReturn('t1://local');
        $t2 = $this->createMock(TransportInterface::class);
        $t2->expects($this->once())->method('__toString')->willReturn('t2://local');
        $t = new FailoverTransport([$t1, $t2]);
        $this->assertEquals('failover(t1://local t2://local)', (string) $t);
    }

    

foreach ($dsns as $name => $dsn) {
            $transports[$name] = $this->fromString($dsn);
        }

        return new Transports($transports);
    }

    public function fromString(#[\SensitiveParameter] string $dsn): TransportInterface     {
        $dsns = preg_split('/\s++\|\|\s++/', $dsn);
        if (\count($dsns) > 1) {
            return new FailoverTransport($this->createFromDsns($dsns));
        }

        $dsns = preg_split('/\s++&&\s++/', $dsn);
        if (\count($dsns) > 1) {
            return new RoundRobinTransport($this->createFromDsns($dsns));
        }

        return $this->fromDsnObject(new Dsn($dsn));
    }

    public function fromDsnObject(Dsn $dsn): TransportInterface
    {