try {
      stack.runTearDown();
      fail("runTearDown should have thrown an exception");
    } catch (ClusterException expected) {
      assertThat(expected).hasCauseThat().hasMessageThat().isEqualTo("two");
    } catch (RuntimeException e) {
      throw new RuntimeException(
          "A ClusterException should have been thrown, rather than a " + e.getClass().getName(), e);
    }

    assertEquals(true, tearDownOne.ran);

                throw new TransferCancelledException();
            }

            @Override
            public void transferProgressed(TransferEvent event) throws TransferCancelledException {
                throw new TransferCancelledException();
            }

            @Override
            public void transferCorrupted(TransferEvent event) throws TransferCancelledException {

            throw new XmlPullParserException(e.getMessage(), null, e);
        }
    }

    /**
     * @param reader a reader object.
     * @throws IOException IOException if any.
     * @throws XmlPullParserException XmlPullParserException if
     * any.
     * @return Model
     */
    public Settings read(Reader reader) throws IOException, XmlPullParserException {
        try {

        throw new UnsupportedOperationException("Cannot get available versions in this test case");
    }

    public List<ArtifactVersion> retrieveAvailableVersionsFromDeploymentRepository(
            Artifact artifact, ArtifactRepository localRepository, ArtifactRepository remoteRepository)
            throws ArtifactMetadataRetrievalException {

        }

        public Object evaluate(String expression, Class<?> type) throws ExpressionEvaluationException {
            if (preprocessor != null) {
                try {
                    return preprocessor.preprocessValue(expression, type);
                } catch (BeanConfigurationException e) {
                    throw new ExpressionEvaluationException(e.getMessage(), e);
                }
            }

     */
    public static PluginDescriptor fromXml(@Nonnull String xml) throws XmlReaderException {
        return new DefaultPluginXmlFactory().fromXmlString(xml);
    }

    /**
     * Simply converts the given content to an xml string.
     *
     * @param content the object to convert
     * @return the xml string representation
     * @throws XmlWriterException if an error occurs during the transformation

    @Nonnull
    Collection<String> getChecksumAlgorithmNames();

    /**
     * Returns {@link ChecksumAlgorithm} for given algorithm name, or throws if algorithm not supported.
     *
     * @throws ChecksumAlgorithmServiceException if asked algorithm name is not supported.
     * @throws NullPointerException if passed in name is {@code null}.
     */
    @Nonnull
    ChecksumAlgorithm select(@Nonnull String algorithmName);

    /**

     * @param writer a writer object.
     * @param settings a settings object.
     * @throws IOException java.io.IOException if any.
     */
    public void write(Writer writer, Settings settings) throws IOException {
        try {
            delegate.write(writer, settings.getDelegate());
        } catch (XMLStreamException e) {
            throw new IOException(e);
        }
    }

    /**
     * Method write.
     *

     * @throws ArtifactResolutionException in case of resolution issue
     * @throws ArtifactNotFoundException if an artifact is not found
     */
    Set<Artifact> resolve(MavenProject project, Collection<String> scopesToResolve, MavenSession session)
            throws ArtifactResolutionException, ArtifactNotFoundException;

    /**

     * @throws XmlPullParserException XmlPullParserException if
     *                                any.
     */
    public Metadata read(InputStream in) throws IOException, XmlPullParserException {
        try {
            return new Metadata(delegate.read(in));
        } catch (XMLStreamException e) {
            throw new XmlPullParserException(e.getMessage(), null, e);
        }
    }