*/
@GwtCompatible
@Immutable
public final class ImmutableDoubleArray implements Serializable {
  private static final ImmutableDoubleArray EMPTY = new ImmutableDoubleArray(new double[0]);

  /** Returns the empty array. */
  public static ImmutableDoubleArray of() {
    return EMPTY;
  }

  /** Returns an immutable array containing a single value. */
  public static ImmutableDoubleArray of(double e0) {

 * @since 22.0
 */
@GwtCompatible
@Immutable
public final class ImmutableIntArray implements Serializable {
  private static final ImmutableIntArray EMPTY = new ImmutableIntArray(new int[0]);

  /** Returns the empty array. */
  public static ImmutableIntArray of() {
    return EMPTY;
  }

  /** Returns an immutable array containing a single value. */
  public static ImmutableIntArray of(int e0) {

  }

  /**
   * Returns the string if it is not null, or an empty string otherwise.
   *
   * @param string the string to test and possibly return
   * @return {@code string} if it is not null; {@code ""} otherwise
   */
  static String nullToEmpty(@Nullable String string) {
    return (string == null) ? "" : string;
  }

  /**
   * Returns the string if it is not empty, or a null string otherwise.
   *

    }

    /**
     * Test putResultDataBody with empty array
     */
    @Test
    public void test_putResultDataBody_withEmptyArray() {
        TestFessTransformer transformer = new TestFessTransformer();
        Map<String, Object> dataMap = new HashMap<>();

        transformer.putResultDataBody(dataMap, "empty", "value1");

        String[] emptyArray = new String[] {};

        assertEquals(Long.valueOf(5), facetInfo.minDocCount);
        assertEquals("count.desc", facetInfo.sort);
        assertEquals("unknown", facetInfo.missing);
    }

    // Test init with empty fields
    @Test
    public void test_init_withEmptyFields() {
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getQueryFacetFields() {

    }

    @Test
    @DisplayName("Test readParametersWireFormat with empty buffer")
    void testReadParametersWireFormatEmptyBuffer() throws Exception {
        byte[] buffer = new byte[0];

        // Empty buffer adds one empty FileNotifyInformation
        int result = response.readParametersWireFormat(buffer, 0, 0);
        assertEquals(0, result);

	}

	// There are two possibilities:
	// - We use a KMS -> There must be non-empty key ID and a KMS data key.
	// - We use a K/V -> There must be no key ID and no KMS data key.
	// Otherwise, the caller has passed an invalid argument combination.
	if keyID == "" && len(kmsKey) != 0 {
		logger.CriticalIf(context.Background(), errors.New("The key ID must not be empty if a KMS data key is present"))
	}
	if keyID != "" && len(kmsKey) == 0 {

        assertEquals("\\*\\*\\*\\?\\?\\?", escaped5);

        // Test empty string
        String query6 = "";
        String escaped6 = SuggestUtil.escapeWildcardQuery(query6);
        assertEquals("", escaped6);
    }

    @Test
    public void testGetAsListWithEmptyList() {
        // Test with empty list
        List<String> emptyList = new ArrayList<>();

        // empty instance already generated
        if (emptyInstanceGenerated.get(type.getType()) == freshness.get()) {
          // same freshness, generate again.
          return invokeGeneratorMethod(emptyGenerate);
        } else {
          // Cannot use empty generator. Proceed with other generators.
        }
      } else {
        // never generated empty instance for this type before.

    assertTrue(collection.contains(e0()));
  }

  /*
   * AbstractCollection fails the removeAll(null) test when the subject
   * collection is empty, but we'd still like to test removeAll(null) when we
   * can. We split the test into empty and non-empty cases. This allows us to
   * suppress only the former.
   */

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  @CollectionSize.Require(ZERO)