*
   * <p>Under Android VMs, the methods for retrieving type-use annotations don't exist. This means
   * that {@link NullPointerTester} may misbehave under Android when used on classes that rely on
   * type-use annotations.
   *
   * <p>Under j2objc, the necessary APIs exist, but some (perhaps all) return stub values, like

   *
   * <p>Under Android VMs, the methods for retrieving type-use annotations don't exist. This means
   * that {@link NullPointerTester} may misbehave under Android when used on classes that rely on
   * type-use annotations.
   *
   * <p>Under j2objc, the necessary APIs exist, but some (perhaps all) return stub values, like

   *     Corresponds to `FLAG_FIN`.
   * @param flushHeaders true to force flush the response headers. This should be true unless the
   *     response body exists and will be written immediately.
   */
  @Throws(IOException::class)
  fun writeHeaders(
    responseHeaders: List<Header>,
    outFinished: Boolean,
    flushHeaders: Boolean,
  ) {

            } else {
                String optionalSelectors = unresolvedSelectors.stream()
                        .map(ProjectActivation.ProjectActivationSettings::selector)
                        .collect(Collectors.joining(", "));
                LOGGER.info("The requested optional projects {} do not exist.", optionalSelectors);
            }
        }

            userSettingsFile = resolveFile(userSettingsFile, workingDirectory);

            if (!userSettingsFile.isFile()) {
                throw new FileNotFoundException("The specified user settings file does not exist: " + userSettingsFile);
            }
        } else {
            userSettingsFile = DEFAULT_USER_SETTINGS_FILE;
        }

        File projectSettingsFile;

        //
        d.setScope(Artifact.SCOPE_SYSTEM);
        File file = new File(getBasedir(), "src/test/repository-system/maven-core-2.1.0.jar");
        assertTrue(file.exists(), "Expected " + file + ".exists() to return true");
        d.setSystemPath(file.getCanonicalPath());

        artifact = repositorySystem.createDependencyArtifact(d);

        //

        }

        if (outputFile.exists()) {
            if (logger.isDebugEnabled()) {
                logger.debug("The thumbnail file exists: {}", outputFile.getAbsolutePath());
            }
            return true;
        }

        final File parentFile = outputFile.getParentFile();
        if (!parentFile.exists()) {
            parentFile.mkdirs();
        }

        scope.seed(Object.class, o2);
        assertSame(o2, scope.scope(Key.get(Object.class), () -> null).get());

        scope.exit();
        assertSame(o1, scope.scope(Key.get(Object.class), () -> null).get());

        scope.exit();

        assertThrows(IllegalStateException.class, () -> scope.exit());
    }

    @Test
    void testMultiKeyInstance() throws Exception {

                        installationSettingsPath != null && Files.exists(installationSettingsPath)
                                ? Sources.fromPath(installationSettingsPath)
                                : null)
                .projectSettingsSource(
                        projectSettingsPath != null && Files.exists(projectSettingsPath)
                                ? Sources.fromPath(projectSettingsPath)

        assertFalse(file.exists(), "Remote artifact " + file + " should not be present.");
    }

    protected void assertLocalArtifactNotPresent(Artifact artifact) throws Exception {
        ArtifactRepository localRepo = localRepository();

        String path = localRepo.pathOf(artifact);

        File file = new File(localRepo.getBasedir(), path);