assertTrue(iterator.hasNext());
    assertThat(iterator.next()).isEqualTo("a");
    assertThrows(UnsupportedOperationException.class, () -> iterator.remove());
  }

  @SuppressWarnings("DoNotCall")
  public void testAdd() {
    ListIterator<String> iterator = create();

    assertTrue(iterator.hasNext());
    assertThat(iterator.next()).isEqualTo("a");
    assertThat(iterator.next()).isEqualTo("b");

    assertTrue(iterator.hasNext());
    assertThat(iterator.next()).isEqualTo("a");
    assertThrows(UnsupportedOperationException.class, () -> iterator.remove());
  }

  @SuppressWarnings("DoNotCall")
  public void testAdd() {
    ListIterator<String> iterator = create();

    assertTrue(iterator.hasNext());
    assertThat(iterator.next()).isEqualTo("a");
    assertThat(iterator.next()).isEqualTo("b");

import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link Files}.
 *
 * <p>Some methods are tested in separate files:
 *
 * <ul>
 *   <li>{@link Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
 *   <li>{@link Files#createTempDir()} is tested in {@link FilesCreateTempDirTest}.
 * </ul>
 *
 * @author Chris Nokleberg
 */

    /*
     * We'll give ourselves a pass on testing all the possible ways of breaking the constraint,
     * because we know that newClassMap() is implemented using ConstrainedMap which is itself
     * well-tested. A purist would object to this, but what can I say, we're dirty cheaters.
     */
    map.put(Integer.class, new Integer(5));
    assertThrows(ClassCastException.class, () -> map.put(Double.class, new Long(42)));

import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;

/**
 * Tests for {@link FluentFuture}. The tests cover only the basics for the API. The actual logic is
 * tested in {@link FuturesTest}.
 */
@NullMarked
@GwtCompatible
public class FluentFutureTest extends TestCase {
  @SuppressWarnings({"deprecation", "InlineMeInliner"}) // test of a deprecated method

                }
            }
        };
        ComponentUtil.register(dictionaryManager, "dictionaryManager");

        // Initialize CharMappingFile
        charMappingFile = new CharMappingFile("test_id", testFile.getAbsolutePath(), new Date());
        charMappingFile.manager(dictionaryManager);
    }

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {

                }
            }
        };
        ComponentUtil.register(dictionaryManager, "dictionaryManager");

        // Create StopwordsFile instance
        stopwordsFile = new StopwordsFile("test_id", testFile.getAbsolutePath(), new Date());
        stopwordsFile.manager(dictionaryManager);
    }

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {

    assertEquals(2, copy.size());
    assertThat(copy.iterator().next().member).isSameInstanceAs(copy);
  }

  /*
   * The behavior of toString() and iteration is tested by LinkedHashMultiset,
   * which shares a lot of code with HashMultiset and has deterministic
   * iteration order.
   */

import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;

/**
 * Tests for {@link FluentFuture}. The tests cover only the basics for the API. The actual logic is
 * tested in {@link FuturesTest}.
 */
@NullMarked
@GwtCompatible
public class FluentFutureTest extends TestCase {
  @SuppressWarnings({"deprecation", "InlineMeInliner"}) // test of a deprecated method

<img src="/img/tutorial/body/image04.png">

Isso não é por acaso, todo o framework foi construído em volta deste design.

E foi imensamente testado na fase de design, antes de qualquer implementação, para garantir que funcionaria para todos os editores de texto.

Houveram mudanças no próprio Pydantic para que isso fosse possível.