@Override
    public void transferStarted(TransferEvent event) throws TransferCancelledException {
        if (ongoing.get(new TransferResourceIdentifier(event.getResource())) == Boolean.FALSE) {
            throw new TransferCancelledException();
        }
        put(event, false);
    }

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

        return caught;
      }
      throw new AssertionError(
          "expected to throw " + expectedThrowable.getSimpleName() + " but threw " + t, t);
    }
    if (userPassedSupplier) {
      throw new AssertionError(
          "expected to throw "
              + expectedThrowable.getSimpleName()
              + " but returned result: "
              + result);
    } else {

        return caught;
      }
      throw new AssertionError(
          "expected to throw " + expectedThrowable.getSimpleName() + " but threw " + t, t);
    }
    if (userPassedSupplier) {
      throw new AssertionError(
          "expected to throw "
              + expectedThrowable.getSimpleName()
              + " but returned result: "
              + result);
    } else {

                }
            } else {
                throw new IllegalStateException("unexpected task " + task);
            }
        }
        return mojoExecutions;
    }

    private Map<String, List<MojoExecution>> calculateLifecycleMappings(
            MavenSession session, MavenProject project, String lifecyclePhase)

                } catch (FileNotFoundException | URISyntaxException e) {
                    throw new IllegalStateException("Missing test POM for " + artifact, e);
                }
            } else {
                result.addException(new ArtifactNotFoundException(artifact, (RemoteRepository) null));
                throw new ArtifactResolutionException(results);
            }
        }

        return results;
    }

        return read(new XmlStreamReader(in), strict);
    }

    /**
     * Method read.
     *
     * @param in a in object.
     * @return PersistedToolchains
     * @throws IOException IOException if any.
     * @throws XmlPullParserException XmlPullParserException if
     *         any.
     */

        Objects.requireNonNull(output, "output cannot be null");
        Objects.requireNonNull(settings, "settings cannot be null");

        try (Writer out = output) {
            new SettingsStaxWriter().write(out, settings.getDelegate());
        } catch (XMLStreamException e) {
            throw new IOException("Error writing settings", e);
        }
    }

  }

  public void testSuccessful() throws Exception {
    assertThat(future.set(1)).isTrue();
    assertSuccessful(future, 1);
  }

  public void testFailed() throws Exception {
    Exception cause = new Exception();
    assertThat(future.setException(cause)).isTrue();
    assertFailed(future, cause);
  }

  public void testCanceled() throws Exception {

        this.repoSystem = repoSystem;
    }

    public List<CoreExtensionEntry> loadCoreExtensions(
            MavenExecutionRequest request, Set<String> providedArtifacts, List<CoreExtension> extensions)
            throws Exception {
        try (CloseableSession repoSession = repositorySystemSessionFactory
                .newRepositorySessionBuilder(request)

     * Reads a JSON file and finds any .adoc files listed that are missing from the given directory.
     */
    private static List<String> findMissingAdocFiles(File jsonFile, String directoryPath) throws IOException {
        List<String> missingFiles = new ArrayList<>();

        Gson gson = new Gson();
        List<AdocFileEntry> entries;
        try (FileReader reader = new FileReader(jsonFile)) {