*     a provided list is null
   * @since 19.0
   */
  public static <B> List<List<B>> cartesianProduct(List<? extends List<? extends B>> lists) {
    return CartesianList.create(lists);
  }

  /**
   * Returns every possible list that can be formed by choosing one element from each of the given

import static org.junit.Assert.assertThat;

import java.util.Iterator;
import java.util.List;

import org.junit.Test;

/**
 * @author koichik
 *
 */
public class MultiIteratorTest {

    /**
     *
     */
    @Test
    public void test() {
        final List<String> list1 = asList("Foo", "Bar");
        final List<String> list2 = asList("Baz");

        @SuppressWarnings("unchecked")

        List<FileNotifyInformation> list2 = response.getNotifyInformation();

        assertNotNull(list1);
        assertNotNull(list2);
        assertSame(list1, list2);
    }

    @Test
    @DisplayName("Test toString returns expected format")
    void testToString() {
        String result = response.toString();

        assertNotNull(result);

        return channels.values()
                .stream()
                .filter(ChannelInfo::isHealthy)
                .collect(ArrayList::new, (list, item) -> list.add(item), (list1, list2) -> list1.addAll(list2));
    }

    /**
     * Select a channel for the given message
     *
     * @param message message to send
     * @return selected channel
     */

Jesse Wilson <******@****.***> 1748383249 -0400

cpovirk <******@****.***> 1510351134 -0800

Yuri Schimke <******@****.***> 1735656653 +0200

Daryl White <******@****.***> 1755022836 -0400

## Listen von Modellen

Genauso können Sie eine Response deklarieren, die eine Liste von Objekten ist.

Verwenden Sie dafür Pythons Standard `typing.List` (oder nur `list` in Python 3.9 und darüber):

{* ../../docs_src/extra_models/tutorial004_py39.py hl[18] *}

## Response mit beliebigem `dict`

## Lista de modelos

Da mesma forma, você pode declarar respostas de listas de objetos.

Para isso, use o padrão Python `typing.List` (ou simplesmente `list` no Python 3.9 e superior):

{* ../../docs_src/extra_models/tutorial004.py hl[1,20] *}

## Resposta com `dict` arbitrário