assertNotNull(result, "Icon result should not be null for " + icon);

            // Result should be consistent with charset's canEncode capability
            boolean canEncode = StandardCharsets.ISO_8859_1.newEncoder().canEncode(icon.getUnicodeChar());
            String expected = canEncode ? String.valueOf(icon.getUnicodeChar()) : icon.getAsciiFallback();

            public Optional<UnaryOperator<String>> getInterpolationSource() {
                return Optional.ofNullable(interpolationSource);
            }

            @Override
            public boolean equals(Object o) {
                return o instanceof DefaultSettingsBuilderRequest that
                        && Objects.equals(installationSettingsSource, that.installationSettingsSource)

            System.err.println("Unable determine version from JAR file: " + e.getMessage());
        }

        return properties;
    }

    public static void showError(Logger logger, String message, Throwable e, boolean showStackTrace) {
        if (logger == null) {
            System.err.println(message);
            if (showStackTrace && e != null) {
                e.printStackTrace(System.err);
            }

                return null;
            }

            @Override
            public boolean isOpen() {
                return false;
            }

            @Override
            public boolean isStale() {
                return false;
            }

            @Override
            public void close() throws CIFSException {
            }

  }

  private static class WatchedCreatorLoader extends CacheLoader<String, Integer> {
    boolean wasCalled = false; // must be set in load()
    String keyPrefix = KEY_PREFIX;
    int valuePrefix = VALUE_PREFIX;

    WatchedCreatorLoader() {}

    void reset() {
      wasCalled = false;
    }

    boolean wasCalled() {
      return wasCalled;
    }

    void setKeyPrefix(String keyPrefix) {

        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);

        // Test that it can be caught as CIFSException
        boolean caughtAsCIFSException = false;
        try {
            throw exception;
        } catch (CIFSException e) {
            caughtAsCIFSException = true;
            assertEquals(exception, e);
        }

    }

    @Override public String[] getSupportedCipherSuites() {
      return delegate.getSupportedCipherSuites();
    }

    @Override public Socket createSocket(
        Socket socket, String host, int port, boolean autoClose) throws IOException {
      return configureSocket((SSLSocket) delegate.createSocket(socket, host, port, autoClose));
    }

    @Override public Socket createSocket(String host, int port) throws IOException {

        this.messageBuilderFactory = requireNonNull(messageBuilderFactory);
    }

    @Override
    public void configure(MavenProject project, MojoExecution mojoExecution, boolean allowPluginLevelConfig) {
        String g = mojoExecution.getPlugin().getGroupId();

        String a = mojoExecution.getPlugin().getArtifactId();

        Plugin plugin = findPlugin(g, a, project.getBuildPlugins());

            this.hashCode = hash;
        }

        @Override
        public int hashCode() {
            return hashCode;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }

            if (obj instanceof CacheKey that) {
                return Objects.equals(this.artifactId, that.artifactId)

    @Nullable Object element;
    List<Object> extras;

    ToOptionalState() {
      element = null;
      extras = emptyList();
    }

    IllegalArgumentException multiples(boolean overflow) {
      StringBuilder sb =
          new StringBuilder().append("expected one element but was: <").append(element);
      for (Object o : extras) {
        sb.append(", ").append(o);
      }