* @return the selected channel, or null if no channels available
     */
    public ChannelInfo selectChannel(String sessionId) {
        ChannelGroup channelGroup = sessionChannels.get(sessionId);
        if (channelGroup == null) {
            log.warn("No channel group found for session {}", sessionId);
            return null;
        }

            final HttpSession session = r.getSession(false);
            if (session != null) {
                return session.getId();
            }
            final String preference = r.getParameter("preference");
            if (preference != null) {
                return Integer.toString(preference.hashCode());
            }

    }

    @Test
    @DisplayName("Should handle null message")
    void testNullMessage() {
        // When/Then
        assertDoesNotThrow(() -> {
            CIFSException exception = new CIFSException((String) null);
            assertNotNull(exception);
        });
    }

    @Test
    @DisplayName("Should handle null cause")
    void testNullCause() {
        // When/Then

    Long n1 = 42L;
    Long n2 = MoreObjects.firstNonNull(null, n1);
    assertSame(n1, n2);

    Boolean b1 = true;
    Boolean b2 = MoreObjects.firstNonNull(b1, null);
    assertSame(b1, b2);
  }

  public void testFirstNonNull_throwsNullPointerException() {
    assertThrows(NullPointerException.class, () -> MoreObjects.firstNonNull(null, null));
  }

  // ToStringHelper's tests are in ToStringHelperTest

            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));
            return null;
        }).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));
            return null;
        });
        kuromojiService.store(body.dictId, entity);
        return asJson(

            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));
            return null;
        }).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));
            return null;
        });
        protwordsService.store(body.dictId, entity);
        return asJson(

        String[] tags = null;
        String[] roles = null;
        String[] fields = null;
        String[] excludes = null;

        String result = popularWordHelper.getCacheKey(seed, tags, roles, fields, excludes);

        assertNotNull(result);
        assertTrue(result.contains("test_seed"));

        // Should contain 4 separators even with null arrays

        assertEquals(2, transWaitNamedPipe.setupCount);
    }

    @Test
    @DisplayName("Constructor with null pipe name should handle gracefully")
    void testConstructorWithNullPipeName() {
        // Act
        transWaitNamedPipe = new TransWaitNamedPipe(mockConfig, null);

        // Assert
        assertNotNull(transWaitNamedPipe);
        assertNull(transWaitNamedPipe.name);
    }

    @Test

        Set<Artifact> resolved = new LinkedHashSet<>();

        if (projects == null || projects.isEmpty()) {
            return resolved;
        }

        if ((scopesToCollect == null || scopesToCollect.isEmpty())
                && (scopesToResolve == null || scopesToResolve.isEmpty())) {
            return resolved;
        }

        /*

  override fun createRequestBody(
    request: Request,
    contentLength: Long,
  ): Sink = stream!!.sink

  override fun writeRequestHeaders(request: Request) {
    if (stream != null) return

    val hasRequestBody = request.body != null
    val requestHeaders = http2HeadersList(request)
    stream = http2Connection.newStream(requestHeaders, hasRequestBody)