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.");
    }