SmbSessionImpl session = newSession();
        String s = session.toString();
        assertTrue(s.contains("targetHost=server.example"));
        assertTrue(s.contains("targetDomain=EXAMPLE"));
    }

    @Test
    @DisplayName("getExpiration: null when unset, value when positive")
    void testGetExpiration() {
        SmbSessionImpl session = newSession();
        assertNull(session.getExpiration());

    String MODEL_VERSION_4_2_0 = "4.2.0";

    List<String> KNOWN_MODEL_VERSIONS = List.of(MODEL_VERSION_4_0_0, MODEL_VERSION_4_1_0, MODEL_VERSION_4_2_0);

    ModelBuilderSession newSession();

    interface ModelBuilderSession {

        ModelBuilderResult build(ModelBuilderRequest request) throws ModelBuilderException;
    }

            keyVersions.put(sessionId, newVersion);
            keyCreationTimes.put(sessionId, System.currentTimeMillis());

            log.info("Rotated key for session {} from version {} to {}", sessionId, currentVersion, newVersion);

            // Securely wipe the old key copy
            secureWipe(currentKey);
            secureWipe(newKey);

            return newVersion;

        } catch (Exception e) {

        // Initial version should be 0
        assertEquals(0, keyManager.getKeyVersion(sessionId), "Initial version should be 0");

        // Rotate key
        int newVersion = keyManager.rotateSessionKey(sessionId);
        assertEquals(1, newVersion, "New version should be 1");
        assertEquals(1, keyManager.getKeyVersion(sessionId), "Key version should be updated");

        // Verify old key is archived