suppliedDomain = new String(domain, getOEMEncoding());
        }
        String suppliedWorkstation = null;
        if ((flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED) != 0) {
            final byte[] workstation = readSecurityBuffer(material, 24);
            suppliedWorkstation = new String(workstation, getOEMEncoding());
        }
        setFlags(flags);

            setSuppliedDomain(new String(domain, getOEMEncoding()));
        }
        pos += 8;

        if ((flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED) != 0) {
            final byte[] workstation = readSecurityBuffer(material, pos);
            setSuppliedWorkstation(new String(workstation, getOEMEncoding()));
        }
        pos += 8;
    }

            if (targetName != null && targetName.length() != 0) {
                targetBytes = (flags & NTLMSSP_NEGOTIATE_UNICODE) != 0 ? targetName.getBytes(UNI_ENCODING)
                        : targetName.toUpperCase().getBytes(getOEMEncoding());
                size += targetBytes.length;
            } else {
                flags &= 0xffffffff ^ NTLMSSP_REQUEST_TARGET;
            }
        }

        if (targetInformationBytes != null) {

            when(mockConfig.getOemEncoding()).thenReturn("UTF-8");

            // When
            byte[] result = Strings.getOEMBytes(TEST_STRING, mockConfig);

            // Then
            assertNotNull(result, "Result should not be null");
            assertTrue(result.length > 0, "Result should not be empty");
            verify(mockConfig).getOemEncoding();
        }

        @Test

    void testGetPreNTLMResponse_basicAndInteractions() throws Exception {
        // Arrange
        when(cifsContext.getConfig()).thenReturn(configuration);
        when(configuration.getOemEncoding()).thenReturn("Cp850");
        String password14 = "ABCDEFGHIJKLMN"; // 14 chars
        String password15 = "ABCDEFGHIJKLMNO"; // 15 chars, same first 14
        byte[] challenge = hex("0102030405060708");

        assertArrayEquals(payload, actualPayload, "Payload copy must match");
    }

    @Test
    @DisplayName("getOEMEncoding returns configured OEM encoding")
    void testGetOEMEncoding() {
        assertEquals(Config.DEFAULT_OEM_ENCODING, NtlmMessage.getOEMEncoding(), "OEM encoding should match config’s default value");
    }

        assertEquals(pos, NtlmMessage.readULong(dest, off), "Position should still be written for empty source.");
    }

    @Test
    void testGetOEMEncoding() {
        // Test getOEMEncoding
        assertEquals("Cp850", NtlmMessage.getOEMEncoding(), "Should return the correct OEM encoding.");
    }

                    target = (flags & NTLMSSP_NEGOTIATE_UNICODE) != 0 ? targetName.getBytes(UNI_ENCODING)
                            : targetName.toUpperCase().getBytes(getOEMEncoding());
                } else {
                    flags &= 0xffffffff ^ NTLMSSP_REQUEST_TARGET;
                }
            }
            if (targetInformation != null) {

            flags = NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_OEM;
            charset = getOEMEncoding();
        } else {
            _sessionKey = readSecurityBuffer(material, 52);
            flags = readULong(material, 60);
            charset = (flags & NTLMSSP_NEGOTIATE_UNICODE) != 0 ? UNI_ENCODING : getOEMEncoding();
        }
        setSessionKey(_sessionKey);
        setFlags(flags);

        writeUShort(dest, offset + 2, length);
        writeULong(dest, offset + 4, bodyOffset);
        System.arraycopy(src, 0, dest, bodyOffset, length);
    }

    static String getOEMEncoding() {
        return OEM_ENCODING;
    }

    /**
     * Returns the raw byte representation of this message.
     *
     * @return A <code>byte[]</code> containing the raw message material.
     */