lenient().when(mockConfig.getOemEncoding()).thenReturn("UTF-8");
    }

    @Test
    void constructor_withConfigOnly_shouldInitializeFields() throws Exception {
        Name name = new Name(mockConfig);

        Field configField = Name.class.getDeclaredField("config");
        configField.setAccessible(true);
        assertSame(mockConfig, configField.get(name));

            Referral ref = new Referral();
            RuntimeCIFSException exception = assertThrows(RuntimeCIFSException.class, () -> ref.decode(testBuffer, 0, testBuffer.length),
                    "Should have thrown exception for version " + version);

            assertTrue(exception.getMessage().contains("Version " + version + " referral not supported"),
                    "Exception message should contain version");

        }
        if (logger.isDebugEnabled()) {
            logger.debug("availableSearcherNameSet={}", availableSearcherNameSet);
        }
    }

    @Override
    @PreDestroy
    public void close() throws Exception {
        if (executorService != null) {
            try {
                executorService.shutdown();
                executorService.awaitTermination(60, TimeUnit.SECONDS);

The parameter `name` is defined as `Optional[str]`, but it is **not optional**, you cannot call the function without the parameter:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

The `name` parameter is **still required** (not *optional*) because it doesn't have a default value. Still, `name` accepts `None` as the value:

```Python

{* ../../docs_src/python_types/tutorial009c.py hl[1,4] *}

O paâmetro `name` é definido como `Optional[str]`, mas ele **não é opcional**, você não pode chamar a função sem o parâmetro:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

O parâmetro `name` **ainda é obrigatório** (não *opicional*) porque ele não possui um valor padrão. Mesmo assim, `name` aceita `None` como valor:

```Python

  private SortedMultiset<E> sortedMultiset;
  private List<E> entries;
  private Entry<E> a;
  private Entry<E> b;
  private Entry<E> c;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    sortedMultiset = (SortedMultiset<E>) getMultiset();
    entries =
        copyToList(
            getSubjectGenerator()

  private StatsAccumulator longManyValuesAccumulatorByAddAllIterator;
  private StatsAccumulator longManyValuesAccumulatorByAddAllVarargs;

  @Override
  protected void setUp() throws Exception {
    super.setUp();

    emptyAccumulator = new StatsAccumulator();

    emptyAccumulatorByAddAllEmptyIterable = new StatsAccumulator();

   * contains any match for the given regular expression pattern. The test used is equivalent to
   * {@code Pattern.compile(pattern).matcher(arg).find()}
   *
   * @throws IllegalArgumentException if the pattern is invalid
   * @since 3.0
   */
  @GwtIncompatible // Only used by other GWT-incompatible code.
  public static Predicate<CharSequence> containsPattern(String pattern) {

   * are inclusive). For example, to match any lowercase letter of the English alphabet, use {@code
   * CharMatcher.inRange('a', 'z')}.
   *
   * @throws IllegalArgumentException if {@code endInclusive < startInclusive}
   */
  public static CharMatcher inRange(char startInclusive, char endInclusive) {
    return new InRange(startInclusive, endInclusive);
  }

  /**

Tham số `name` được định nghĩa là `Optional[str]`, nhưng nó **không phải là tùy chọn**, bạn không thể gọi hàm mà không có tham số:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

Tham số `name` **vẫn được yêu cầu** (không phải là *tùy chọn*) vì nó không có giá trị mặc định. Trong khi đó, `name` chấp nhận `None` như là giá trị:

```Python