assertEquals("NtlmChallenge[challenge=0x,dc=EMPTYSERVER]", result);
        }

        @Test
        @DisplayName("toString with single byte challenge")
        void testToStringWithSingleByte() {
            byte[] challenge = new byte[] { (byte) 0xAB };
            UniAddress dc = mock(UniAddress.class);
            when(dc.toString()).thenReturn("TESTDC");