assertDoesNotThrow(() -> channelManager.establishReplacementChannel());
    }

    @Test
    void testGetChannelForTransport() {
        ChannelInfo result = channelManager.getChannelForTransport(mockTransport);
        assertNull(result); // No channels registered yet
    }

    @Test
    void testChannelManagerLifecycle() {
        // Test complete lifecycle

        when(renewable.renew()).thenReturn(returned);

        // Act: invoke renew()
        CredentialsInternal result = renewable.renew();

        // Assert: verify interaction and returned value
        verify(renewable, times(1)).renew();
        assertSame(returned, result, "renew() should return the stubbed value");

        // Negative interaction check: no further interactions with the mock

    void shouldForceSigningReturns(boolean expected) {
        when(locator.shouldForceSigning()).thenReturn(expected);

        boolean result = locator.shouldForceSigning();

        assertEquals(expected, result);
        verify(locator, times(1)).shouldForceSigning();
        verifyNoMoreInteractions(locator);
    }

    // Happy path: overlaps delegates to implementation and returns as stubbed

    @ValueSource(strings = { "192.168.0.1", "123.45.67.89", "1.2.3.4" })
    void isDotQuadIPRecognizesDotQuadIP(String ip) {
        // Arrange & Act
        boolean result = UniAddress.isDotQuadIP(ip);
        // Assert
        assertTrue(result, "isDotQuadIP should return true for dot-quad IP");
    }

    @ParameterizedTest
    @ValueSource(strings = { "192.168.0", "abcd", "192.168" })

   * {@code multimap}.
   */
  public <K extends K0, V extends V0> Multimap<K, V> build(
      Multimap<? extends K, ? extends V> multimap) {
    Multimap<K, V> result = build();
    result.putAll(multimap);
    return result;
  }

  /**
   * A specialization of {@link MultimapBuilder} that generates {@link ListMultimap} instances.
   *
   * @since 16.0
   */

    }
  }

  /**
   * Verifies that a collection is immutable.
   *
   * <p>A collection is considered immutable if:
   *
   * <ol>
   *   <li>All its mutation methods result in UnsupportedOperationException, and do not change the
   *       underlying contents.
   *   <li>All methods that return objects that can indirectly mutate the collection throw

     */
    protected ExecJob() {
        // Default constructor
    }

    /**
     * Executes the job and returns the result as a string.
     * This method contains the main business logic for the specific job implementation.
     *
     * @return the execution result message or summary
     */
    public abstract String execute();

    /**
     * Returns the execution type identifier for this job.

        byte[] data = new byte[] { 0, 1, 2, 3, 4 };
        cos.write(data);
        assertTrue(cos.isInMemory());
        byte[] result = cos.getData();
        assertNotNull(result);
        assertArrayEquals(data, result);
        cos.close();
    }

    @Test
    public void testFlushInMemory() throws IOException {
        // flush() should work with in-memory data

    }

    Map<K, ImmutableCollection.Builder<V>> ensureBuilderMapNonNull() {
      Map<K, ImmutableCollection.Builder<V>> result = builderMap;
      if (result == null) {
        result = Platform.preservesInsertionOrderOnPutsMap();
        builderMap = result;
      }
      return result;
    }

    ImmutableCollection.Builder<V> newValueCollectionBuilderWithExpectedSize(int expectedSize) {

        final String s = props.getProperty(key);
        int result = -1;
        if (s != null) {
            try {
                result = Integer.parseInt(s);
            } catch (final NumberFormatException nfe) {
                log.error("Not a number", nfe);
            }
        }
        return result;
    }

    /**
     * Retrieve a <code>long</code>. If the key does not exist or