问在用phpunit模拟PDOStatement类的单元测试中出现错误

EN

$mockPDOStatement = $this->createMock(PDOStatement::class);

Error: Call to undefined method ReflectionUnionType::getName()

class Connection
{

    public function getPdo()
    {
        return new PDO(
            dbServer,
            dbUsername,
            dbPassword
        );
    }
}

class Events
{

    private $connection;

    public function __construct(Connection $connection)
    {
        $this->connection = $connection;
    }

    public function getEvent($id)
    {
        $query = 'SELECT * FROM events WHERE id=:id';
        $pdo = $this->dbConnection->getPdo()->prepare($query);
        $pdo->execute(["id" => $id]);
        return $pdo->fetchAll(PDO::FETCH_ASSOC);
    }
}

use PHPUnit\Framework\TestCase;

class EventsTest extends TestCase
{

    private $eventData = [
        'id' => '1',
        'Description' => '',
        'EndTime' => '2021-12-09 18:00:00',
        'IsAllDayEvent' => '0',
        'StartTime' => '2021-12-09 17:00:00',
        'Subject' => 'Prueba Creada desde Google',
    ];

    protected function setUp(): void
    {
        $this->eventd = new Events(
            $this->getConnectionMock(),
        );
    }

    public function testFetchMany()
    {
        $events = $this->eplanEventRepository->getEvent(1);
        $this->assertIsArray($events);
    }

    private function getConnectionMock()
    {

        $mockPDOStatement = $this->createMock(PDOStatement::class);

        $mockPDOStatement->method('fetchAll')
            ->willReturn($this->eventData);

        $mockPDO = $this->createMock(PDO::class);

        $mockPDO->method('prepare')
            ->willReturn($mockPDOStatement);

        $mock = $this->createMock(Connection::class);

        $mock->method('getPdo')
            ->willReturn($mockPDO);

        return $mock;
    }
}