UnsignedLongs.parseUnsignedLong(overflowAsString, radix);
          });
    }

    assertThrows(
        NumberFormatException.class,
        () -> UnsignedLongs.parseUnsignedLong("1234567890abcdef1", 16));
  }

  public void testParseLongThrowsExceptionForInvalidRadix() {
    // Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX, inclusive.
    assertThrows(

        assertTrue(result);
    }

    // Test getImageFilename with docMap
    public void test_getImageFilename_withDocMap() {
        Map<String, Object> docMap = new HashMap<>();
        docMap.put("_id", "1234567890abcdef");

        String filename = thumbnailManager.getImageFilename(docMap);
        assertNotNull(filename);
        assertTrue(filename.endsWith(".png"));
        assertTrue(filename.contains("/"));
    }

        assertEquals("XXFFXXXXXX", new String(dst3));

        // Test long conversion
        char[] dst4 = new char[16];
        Hexdump.toHexChars(0x123456789ABCDEF0L, dst4, 0, 16);
        assertEquals("123456789ABCDEF0", new String(dst4));
    }

    @Test
    @DisplayName("Should verify HEX_DIGITS constant")
    void testHexDigitsConstant() {
        // Verify the HEX_DIGITS array contains correct values

        assertEquals("Password parameter is required", ex.getMessage());
    }

    @ParameterizedTest
    @ValueSource(strings = { "", "password", "pässwörd", "1234567890abcdef" })
    @DisplayName("nTOWFv1 equals getNTHash across inputs")
    void testNTOWFv1_delegatesToGetNTHash(String password) {
        // Act
        byte[] h1 = NtlmUtil.nTOWFv1(password);