@Test
        @DisplayName("list with null root throws NullPointerException")
        void list_withNullRoot_throwsNpe() {
            // Intent: null root is invalid input
            assertThrows(NullPointerException.class, () -> SmbEnumerationUtil.list(null, "*", 0, null, null));
        }

        @Test
        @DisplayName("listFiles with null root throws NullPointerException")
        void listFiles_withNullRoot_throwsNpe() {

                "The exception should be either PACDecodingException or NullPointerException.");

        if (exception instanceof PACDecodingException) {
            assertEquals("Malformed kerberos ticket", exception.getMessage(), "PAC exception should indicate malformed ticket.");
        } else if (exception instanceof NullPointerException) {
            // Empty input causes null ASN1 object, which is expected behavior

    /**
     * Ensure encode throws NPE when passed a null buffer.
     */
    @Test
    @DisplayName("Encode with null buffer throws NullPointerException")
    public void testEncodeNullBuffer() throws NdrException {
        NdrHyper hyper = new NdrHyper(5L);
        assertThrows(NullPointerException.class, () -> hyper.encode(null));
    }

    /**
     * Ensure decode throws NPE when passed a null buffer.
     */
    @Test

        assertEquals(illegalArgException, exception2.getCause());

        // Test with NullPointerException
        Exception nullPointerException = new NullPointerException("SSO context is null");
        SsoProcessException exception3 = new SsoProcessException(message, nullPointerException);
        assertEquals(nullPointerException, exception3.getCause());
    }

    @Test
    public void test_getMessage_withEmptyString() {

    Set<Entry<K, V>> entrySet = map.entrySet();
    if (supportsRemove) {
      assertThrows(NullPointerException.class, () -> entrySet.removeAll(null));
    } else {
      try {
        entrySet.removeAll(null);
        fail("Expected UnsupportedOperationException or NullPointerException.");
      } catch (UnsupportedOperationException | NullPointerException e) {
        // Expected.
      }
    }
    assertInvariants(map);
  }

    ImmutableList.Builder<String> builder = ImmutableList.builder();
    assertThrows(NullPointerException.class, () -> builder.add((String) null));

    assertThrows(NullPointerException.class, () -> builder.add((String[]) null));

    assertThrows(NullPointerException.class, () -> builder.add("a", null, "b"));
  }

  public void testBuilderAddAllHandlesNullsCorrectly() {
    {

    assertThrows(NullPointerException.class, () -> builder.add((String) null));
  }

  public void testBuilderAddAllHandlesNullsCorrectly() {
    {
      ImmutableSortedMultiset.Builder<String> builder = ImmutableSortedMultiset.naturalOrder();
      assertThrows(NullPointerException.class, () -> builder.addAll((Collection<String>) null));
    }

    {

   * the call to {@code contains(null)} is permitted to throw a {@code NullPointerException}.
   *
   * @param message message to use upon assertion failure
   */
  protected void expectNullKeyMissingWhenNullKeysUnsupported(String message) {
    try {
      assertFalse(message, getMap().containsKey(null));
    } catch (NullPointerException tolerated) {
      // Tolerated
    }
  }

  /**

                new ClUnsupportedOperationException("hoge", new NullPointerException());
        assertThat(clUnsupportedOperationException.getMessage(), is("hoge"));
        assertThat(clUnsupportedOperationException.getCause(), instanceOf(NullPointerException.class));
    }

    /**
     * Test method for

    super.setUp();

    empty = new Target(emptyCollection(), "empty");
    /*
     * We test that nullSingleton.retainAll(disjointList) does NOT throw a
     * NullPointerException when disjointList does not, so we can't use
     * MinimalCollection, which throws NullPointerException on calls to
     * contains(null).
     */
    List<E> disjointList = asList(e3(), e4());
    disjoint = new Target(disjointList, "disjoint");