initializeFilter();

        // Test request without Authorization header should challenge client
        when(request.getHeader("Authorization")).thenReturn(null);
        when(httpSession.getAttribute("NtlmHttpAuth")).thenReturn(null);

        filter.doFilter(request, response, filterChain);

        verify(response).setStatus(HttpServletResponse.SC_UNAUTHORIZED);

internal fun Headers.commonValues(name: String): List<String> {
  var result: MutableList<String>? = null
  for (i in 0 until size) {
    if (name.equals(name(i), ignoreCase = true)) {
      if (result == null) result = ArrayList(2)
      result.add(value(i))
    }
  }
  return result?.unmodifiable().orEmpty()
}

        objAttr.decode(mockNdrBuffer);

        assertEquals(100, objAttr.length);
        assertNull(objAttr.root_directory); // null because _root_directoryp was 0
        assertNull(objAttr.object_name); // Should be null when _object_namep is 0

    Long n1 = 42L;
    Long n2 = MoreObjects.firstNonNull(null, n1);
    assertSame(n1, n2);

    Boolean b1 = true;
    Boolean b2 = MoreObjects.firstNonNull(b1, null);
    assertSame(b1, b2);
  }

  public void testFirstNonNull_throwsNullPointerException() {
    assertThrows(NullPointerException.class, () -> MoreObjects.firstNonNull(null, null));
  }

  // ToStringHelper's tests are in ToStringHelperTest

        assertNull(DocumentUtil.getValue(null, "key", String.class));
        assertNull(DocumentUtil.getValue(null, "key", Integer.class));
    }

    public void test_getValue_with_null_key() {
        Map<String, Object> doc = new HashMap<>();
        doc.put("key", "value");
        assertNull(DocumentUtil.getValue(doc, null, String.class));
        assertNull(DocumentUtil.getValue(doc, null, Integer.class));
    }

        assertEquals(0, response.writeDataWireFormat(null, 0));

        // Read methods return 0 without accessing null buffer
        assertEquals(0, response.readSetupWireFormat(null, 0, 0));
        assertEquals(0, response.readParametersWireFormat(null, 0, 0));
        assertEquals(0, response.readDataWireFormat(null, 0, 0));
    }

    @Test
    @DisplayName("Methods should handle empty buffer")

     *
     * @param file The file, must not be {@code null}.
     * @deprecated Use {@link #FileSource(Path)} instead.
     */
    @Deprecated
    public FileSource(File file) {
        this(Objects.requireNonNull(file, "file cannot be null").toPath());
    }

    /**
     * Creates a new source backed by the specified file.
     *
     * @param path The file, must not be {@code null}.
     * @since 4.0.0
     */

        *             If null, the method returns null.
        * @return The SmbAuthentication associated with the path, or null if no
        *         matching authentication is found or if the path is null.
        */
    public SmbAuthentication get(final String path) {
        if (path == null) {
            return null;
        }

  public void testCount_nullAbsent() {
    assertEquals("multiset.count(null) didn't return 0", 0, getMultiset().count(null));
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
  public void testCount_null_forbidden() {
    assertThrows(NullPointerException.class, () -> getMultiset().count(null));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)

                assertTrue(true);
                return;
            }
            // Should handle null keywords gracefully
            assertNotNull(functionBuilders);
        } catch (Exception e) {
            // May throw exception due to null handling
            assertNotNull(e);
        }
    }

    public void test_keyMatchHelper_constructor() {