*
     * @param algorithm
     *            The algorithm (refer to the Javadoc of {@link MessageDigest} for available algorithms).
     *            Must not be {@literal null} or an empty string.
     * @return {@link MessageDigest}
     * @throws RuntimeException
     *             If a {@link NoSuchAlgorithmException} occurs
     */
    public static MessageDigest getInstance(final String algorithm) {

        return Arrays.stream(DosError.DOS_ERROR_CODES).filter(pair -> pair[0] == dosErrorCode).map(pair -> pair[1]).findFirst();
    }

    @Test
    @DisplayName("DOS_ERROR_CODES is non‑null and non‑empty")
    void testCodesArrayExistence() {
        assertNotNull(DosError.DOS_ERROR_CODES, "DOS_ERROR_CODES should be non‑null");

/**
 * Tests for {@code MoreCollectors}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullMarked
public class MoreCollectorsTest extends TestCase {
  public void testToOptionalEmpty() {
    assertThat(Stream.empty().collect(toOptional())).isEmpty();
  }

  public void testToOptionalSingleton() {
    assertThat(Stream.of(1).collect(toOptional())).hasValue(1);
  }

  public void testToOptionalNull() {

    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)

        }

        @Override
        public String id() {
            return "UNRESOLVED";
        }

        @Override
        public Optional<String> option() {
            return Optional.empty();
        }

        @Override
        public String[] option(Iterable<? extends Path> paths) {
            return new String[0];
        }
    };

    /**

    }

    /**
     * Test validateInputStream with edge case: empty stream.
     */
    public void test_validateInputStream_acceptsEmptyStream() {
        final InputStream emptyStream = new ByteArrayInputStream(new byte[0]);

        // Should not throw exception for empty but non-null stream
        extractor.testValidateInputStream(emptyStream);
    }

    /**

     * ability to throw the correct exception in the future.
     */
    assertThrows(NoSuchElementException.class, empty::peek);
    assertThrows(NoSuchElementException.class, empty::peek);
  }

  public void testSneakyThrow() throws Exception {
    Iterator<Integer> iter =
        new AbstractIterator<Integer>() {
          boolean haveBeenCalled;

    }

    @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);

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   * <p>Two {@code SetMultimap} instances are equal if, for each key, they contain the same values.
   * Equality does not depend on the ordering of keys or values.
   *
   * <p>An empty {@code SetMultimap} is equal to any other empty {@code Multimap}, including an
   * empty {@code ListMultimap}.
   */
  @Override
  boolean equals(@Nullable Object obj);