Map<C, V> row = safeGet(rowMap(), rowKey);
    return row != null && Maps.safeContainsKey(row, columnKey);
  }

  @Override
  public @Nullable V get(@Nullable Object rowKey, @Nullable Object columnKey) {
    Map<C, V> row = safeGet(rowMap(), rowKey);
    return (row == null) ? null : safeGet(row, columnKey);
  }

  @Override
  public boolean isEmpty() {
    return size() == 0;
  }

      ImmutableMapEntry<K, V> effectiveEntry =
          checkNoConflictInKeyBucket(key, value, keyBucketHead, throwIfDuplicateKeys);
      if (effectiveEntry == null) {
        // prepend, not append, so the entries can be immutable
        effectiveEntry =
            (keyBucketHead == null)
                ? makeImmutable(entry, key, value)
                : new NonTerminalImmutableMapEntry<K, V>(key, value, keyBucketHead);

        id = null;
        name = null;
        target = null;
        cronExpression = null;
        scriptType = null;
        crawler = null;
        jobLogging = null;
        available = null;
        sortOrder = null;
        createdBy = null;
        createdTime = null;
        versionNo = null;

    }

    /**

     * @return CURL request object or null if header is invalid
     */
    private CurlRequest getCurlRequest(final String header) {
        if (StringUtil.isBlank(header)) {
            return null;
        }

        final String[] values = header.split(" ");
        if (values.length != 2) {
            return null;
        }

        final String path;

        verifyNoMoreInteractions(renewable);
    }

    @Test
    @DisplayName("Edge: calling renew() on a null reference throws NPE")
    void renewOnNullReferenceThrowsNPE() {
        // Arrange: null reference to the interface
        SmbRenewableCredentials creds = null;

        // Act + Assert: invoking renew() on null triggers NullPointerException
        assertThrows(NullPointerException.class, () -> {

    private SmbComBlankResponse blank_resp = null;
    private DfsReferral dfsReferral = null; // For getDfsPath() and getServerWithDfs()

    /**
     * DFS resolver instance
     */
    protected static Dfs dfs;

    NtlmPasswordAuthentication auth; // Cannot be null
    SmbTree tree = null; // Initially null
    String unc; // Initially null; set by getUncPath; never ends with '/'

        pageSize = getDefaultPageSize();
        currentPageNumber = getDefaultCurrentPageNumber();

        id = null;
        name = null;
        value = null;
        sortOrder = null;
        createdBy = null;
        createdTime = null;
        versionNo = null;

    }

    /**
     * Gets the default current page number.
     * @return The default current page number.
     */

   *
   * @param eventClass a class to assert that the returned event is an instance of, or null to
   *     take any event class.
   * @param elapsedMs the time in milliseconds elapsed since the immediately-preceding event, or
   *     -1L to take any duration.
   */
  fun takeEvent(
    eventClass: Class<out ConnectionEvent>? = null,
    elapsedMs: Long = -1L,
  ): ConnectionEvent {
    val result = eventSequence.remove()

   */
  data class ConnectResult(
    val plan: Plan,
    val nextPlan: Plan? = null,
    val throwable: Throwable? = null,
  ) {
    val isSuccess: Boolean
      get() = nextPlan == null && throwable == null
  }

        smbtStatic = mockStatic(SmbTransport.class);
        smbtStatic.when(() -> SmbTransport.getSmbTransport(addr, 445, inet, 0, null)).thenReturn(transport);
        smbtStatic.when(() -> SmbTransport.getSmbTransport(addr, 445)).thenReturn(transport);
    }

    @AfterEach
    void tearDown() {
        if (smbtStatic != null) {
            smbtStatic.close();
        }
    }

    @Test
    void transportLazyInitialisation() {