// Arrange
        nodeStatusRequest = new NodeStatusRequest(mockConfig, null);
        byte[] dst = new byte[100];

        // Act & Assert
        assertThrows(NullPointerException.class, () -> {
            nodeStatusRequest.writeBodyWireFormat(dst, 0);
        });
    }

    @Test
    void multipleWriteBodyWireFormat_shouldProduceSameResult() {
        // Arrange

  // creation cost.
  @CanIgnoreReturnValue
  static Object checkElementNotNull(Object element, int index) {
    if (element == null) {
      throw new NullPointerException("at index " + index);
    }
    return element;
  }

        @Test
        @DisplayName("Should handle null buffer in decode")
        void testNullBuffer() {
            FileFsSizeInformation info = new FileFsSizeInformation();

            assertThrows(NullPointerException.class, () -> {
                info.decode(null, 0, 0);
            });
        }

        @Test
        @DisplayName("Should handle insufficient buffer length")

      assertEquals(0, cache.size());

      entry.setValue(3);
      assertEquals(1, cache.size());
      assertEquals(3, cache.getIfPresent(1));
      checkValidState(cache);

      assertThrows(NullPointerException.class, () -> entry.setValue(null));
      checkValidState(cache);
    }
  }

  /* ---------------- Local utilities -------------- */

   * safe to do so. The exact circumstances under which a copy will or will not be performed are
   * undocumented and subject to change.
   *
   * @throws NullPointerException if any key or value in {@code multimap} is null
   */
  public static <K, V> ImmutableSetMultimap<K, V> copyOf(
      Multimap<? extends K, ? extends V> multimap) {
    return copyOf(multimap, null);
  }

        }
      }
    }
  }

  public void testToArray_withNull() {
    List<@Nullable Boolean> list = Arrays.asList(false, true, null);
    assertThrows(NullPointerException.class, () -> Booleans.toArray(list));
  }

  @SuppressWarnings({"CollectionIsEmptyTruth", "CollectionIsNotEmptyTruth"})
  public void testAsListIsEmpty() {

            fail("Expected exception for null callback");
        } catch (Exception e) {
            // Expected - null callback should cause exception
            assertTrue(e instanceof NullPointerException);
        }
    }

  }

  /**
   * Creates a new {@code AtomicDoubleArray} with the same length as, and all elements copied from,
   * the given array.
   *
   * @param array the array to copy elements from
   * @throws NullPointerException if array is null
   */
  public AtomicDoubleArray(double[] array) {
    int len = array.length;
    long[] longArray = new long[len];
    for (int i = 0; i < len; i++) {

    @DisplayName("Null handle causes NPE on watch() (invalid input)")
    void constructor_nullHandle_watch_throwsNPE() {
        SmbWatchHandleImpl sut = new SmbWatchHandleImpl(null, 0, false);

        assertThrows(NullPointerException.class, () -> {
            sut.watch();
        });
    }

   *
   * <ul>
   *   <li>The {@link Predicate} returned by this method is {@link Serializable}.
   *   <li>The {@link Predicate} returned by this method catches {@link ClassCastException} and
   *       {@link NullPointerException}.
   *   <li>Code that chains multiple predicates together (especially negations) may be more readable
   *       using this method. For example, {@code not(in(target))} is generally more readable than