public SingleValueIterator(final E value) {
        this.value = value;
    }

    @Override
    public boolean hasNext() {
        return hasNext;
    }

    @Override
    public E next() {
        if (!hasNext) {
            throw new NoSuchElementException();
        }
        hasNext = false;
        return value;
    }

    @Override
    public void remove() {

    @DisplayName("byte[] ctor: empty token throws PACDecodingException with clear message")
    void byteArrayConstructor_emptyToken_throws() {
        // Arrange
        byte[] empty = new byte[0];

        // Act + Assert
        PACDecodingException ex = assertThrows(PACDecodingException.class, () -> new KerberosApRequest(empty, new KerberosKey[0]));
        assertTrue(ex.getMessage().contains("Empty kerberos ApReq"));
    }

    @Test

    void defaultConstructor_hasNullMessageAndCause_andDefaultStatus() {
        // Arrange & Act
        SMBSignatureValidationException ex = new SMBSignatureValidationException();

        // Assert
        assertNull(ex.getMessage(), "Default ctor should not set a message");
        assertNull(ex.getCause(), "Default ctor should not set a cause");

import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static java.util.Collections.sort;
import static org.junit.Assert.assertThrows;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

        // Arrange
        StaticJAASConfiguration cfg = new StaticJAASConfiguration();

        // Act
        AppConfigurationEntry[] entries = cfg.getAppConfigurationEntry("ignored");

        // Assert
        assertNotNull(entries, "Entries array should not be null");
        assertEquals(1, entries.length, "Exactly one entry is expected");
        AppConfigurationEntry e = entries[0];

            // Assert
            assertEquals("S-1-5-21-99", s);
            assertEquals(99, sid.getRid());
        }

        @Test
        @DisplayName("Textual constructor invalid format throws SmbException")
        void testTextualConstructorInvalid() {
            // Arrange
            String bad = "S-1"; // fewer than 3 tokens

            // Act + Assert

        when(mockConnection.getRequestProperty("Accept")).thenReturn("application/json");

        // Act
        ntlmConnection = new NtlmHttpURLConnection(mockConnection, mockCifsContext);

        // Assert
        assertEquals("GET", ntlmConnection.getRequestMethod());
        assertTrue(ntlmConnection.getAllowUserInteraction());
        assertTrue(ntlmConnection.getDoInput());
        assertTrue(ntlmConnection.getDoOutput());

        // Setup: constructor calls advance() once
        when(delegate.hasNext()).thenReturn(true, false);
        when(delegate.next()).thenReturn(fileEntry);

        TestIterator iterator = new TestIterator(null);

        // Verify iteration
        assertTrue(iterator.hasNext());
        assertSame(resource, iterator.next());
        assertFalse(iterator.hasNext());
        assertNull(iterator.next());

        ComponentUtil.register(systemHelper, "systemHelper");
        ComponentUtil.setFessConfig(fessConfig);

        // Execute
        String result = pingSearchEngineJob.execute();

        // Assert
        assertEquals("Status of test-cluster is changed to GREEN.", result);
    }

    // Test normal operation with YELLOW status and no state change
    public void test_execute_yellowStatusNoChange() {

  public @Nullable Entry<E> firstEntry() {
    Iterator<Entry<E>> entryIterator = entryIterator();
    return entryIterator.hasNext() ? entryIterator.next() : null;
  }

  @Override
  public @Nullable Entry<E> lastEntry() {
    Iterator<Entry<E>> entryIterator = descendingEntryIterator();
    return entryIterator.hasNext() ? entryIterator.next() : null;
  }

  @Override
  public @Nullable Entry<E> pollFirstEntry() {