import com.google.common.collect.testing.features.CollectionSize;
import org.junit.Ignore;

/**
 * A generic JUnit test which tests {@code retainAll} operations on a list. Can't be invoked
 * directly; please see {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

        }

        @Test
        @DisplayName("Should set link")
        void testSetLink() {
            String link = "\\\\server\\share\\link";

            // Test with mock
            doNothing().when(mockReferralData).setLink(link);
            mockReferralData.setLink(link);
            verify(mockReferralData, times(1)).setLink(link);

            // Test with concrete implementation

        if (isEmpty(str)) {
            return EMPTY_STRINGS;
        }
        final List<String> list = newArrayList();
        final StringTokenizer st = new StringTokenizer(str, delim);
        while (st.hasMoreElements()) {
            list.add(st.nextElement().toString());
        }
        return list.toArray(new String[list.size()]);
    }

    /**
     * Removes whitespace from the left side of the string.

    return Iterables.transform(
        cartesianProduct,
        new Function<List<Optional<?>>, List<Object>>() {
          @Override
          public List<Object> apply(List<Optional<?>> objs) {
            return Lists.transform(objs, OPTIONAL_TO_NULLABLE);
          }
        });
  }

  private CacheBuilder<Object, Object> createCacheBuilder(
      @Nullable Integer concurrencyLevel,

  }

  @Override
  public void readFully(byte[] b, int off, int len) throws IOException {
    ByteStreams.readFully(this, b, off, len);
  }

  @Override
  public int skipBytes(int n) throws IOException {
    return (int) in.skip(n);
  }

  @CanIgnoreReturnValue // to skip a byte
  @Override
  public int readUnsignedByte() throws IOException {
    int b1 = in.read();
    if (b1 < 0) {
      throw new EOFException();

            Ints.indexOf(
                new int[] {(int) 2, (int) 3, (int) 2, (int) 3, (int) 4, (int) 2, (int) 3},
                new int[] {(int) 2, (int) 3, (int) 4}))
        .isEqualTo(2);
    assertThat(
            Ints.indexOf(
                new int[] {(int) 2, (int) 2, (int) 3, (int) 4, (int) 2, (int) 3, (int) 4},
                new int[] {(int) 2, (int) 3, (int) 4}))
        .isEqualTo(1);
    assertThat(

  @Override
  void readFully(byte[] b);

  @Override
  void readFully(byte[] b, int off, int len);

  // not guaranteed to skip n bytes so result should NOT be ignored
  // use ByteStreams.skipFully or one of the read methods instead
  @Override
  int skipBytes(int n);

  @CanIgnoreReturnValue // to skip a byte
  @Override
  boolean readBoolean();

* `frozenset`:
    * Wird in Requests und Responses wie ein `set` behandelt:
        * Bei Requests wird eine Liste gelesen, Duplikate entfernt und in ein `set` umgewandelt.
        * Bei Responses wird das `set` in eine `list`e umgewandelt.

예를 들면, 데이터베이스에 저장해야하는 경우입니다.

이를 위해, **FastAPI** 에서는 `jsonable_encoder()` 함수를 제공합니다.

## `jsonable_encoder` 사용

JSON 호환 가능 데이터만 수신하는 `fake_db` 데이터베이스가 존재한다고 가정하겠습니다.

예를 들면, `datetime` 객체는 JSON과 호환되는 데이터가 아니므로 이 데이터는 받아들여지지 않습니다.

따라서 `datetime` 객체는 <a href="https://en.wikipedia.org/wiki/ISO_8601" class="external-link" target="_blank">ISO format</a> 데이터를 포함하는 `str`로 변환되어야 합니다.

    * Étant donné que se connecter à un serveur et envoyer un email a tendance à être «lent» (plusieurs secondes), vous pouvez retourner la réponse directement et envoyer la notification en arrière-plan.
* Traiter des données :
    * Par exemple, si vous recevez un fichier qui doit passer par un traitement lent, vous pouvez retourner une réponse «Accepted» (HTTP 202) puis faire le traitement en arrière-plan.