StringWriter writer = new StringWriter();

    StringBuilder builder = new StringBuilder();

    URL url = ResourceUtil.getResource(getClass().getName().replace('.', '/') + ".txt");

    File inputFile = URLUtil.toFile(url);

    File outputFile = new File(inputFile.getParentFile(), ".out");

    /**
     * @throws Exception
     */
    @Test
    public void testIsToOs() throws Exception {

                    .flatMap(this::getProjectArtifacts)
                    .filter(a -> Objects.equals(id, id(a)))
                    .forEach(a -> a.setFile(path != null ? path.toFile() : null));
        }
        if (path == null) {
            paths.remove(id);
        } else {
            paths.put(id, path);
        }
    }

    /**

     * @return The base directory above the root package.
     */
    protected static File getBaseDir(final URL url, final String baseName) {
        assertArgumentNotNull("url", url);

        File file = URLUtil.toFile(url);
        final String[] paths = StringUtil.split(baseName, "/");
        for (final String path : paths) {
            file = file.getParentFile();
        }
        return file;
    }

    /**

     *
     * @param fileUrl
     *            The URL of the Jar file. Must not be {@literal null}.
     * @return The {@link File} of the Jar file.
     */
    public static File toFile(final URL fileUrl) {
        assertArgumentNotNull("fileUrl", fileUrl);

        try {
            final String path = URLDecoder.decode(fileUrl.getPath(), "UTF-8");
            return new File(path).getAbsoluteFile();

                            public Path findRoot(Path basedir) {
                                return basedir;
                            }
                        }));

        context.setProjectDirectory(tempDir.toFile());

        File file = new File(tempDir.resolve("file.txt").toString());
        if (!file.createNewFile()) {
            throw new IOException("Can't create " + file);
        }
    }

    @Test

                Map<String, ?> options = Collections.singletonMap(MetadataReader.IS_STRICT, Boolean.FALSE);

                Metadata pluginGroupMetadata =
                        metadataReader.read(metadata.getPath().toFile(), options);

                List<org.apache.maven.artifact.repository.metadata.Plugin> plugins = pluginGroupMetadata.getPlugins();

                if (plugins != null) {

            if (normalizedPath.contains("..")) {
                throw new IllegalArgumentException("Invalid file path");
            }
            final File file = filePath.toFile();
            final String canonicalPath = file.getCanonicalPath();
            final String varPath = System.getProperty("fess.var.path");
            if (varPath != null) {

                }
            } catch (final Exception e) {
                throw new PluginException("Failed to install the artifact " + artifact.getName(), e);
            }
        } else {
            try (final InputStream in = new FileInputStream(url)) {
                CopyUtil.copy(in, ResourceUtil.getPluginPath(fileName).toFile());
            } catch (final Exception e) {

                file = basedir.resolve(file.getPath())
                        .normalize()
                        .toAbsolutePath()
                        .toFile();
            }
        }
        return file;
    }

                    }
                    processArgs.add(String.join(" ", Arrays.asList(input.args())));
                    builder.command(processArgs);
                    builder.directory(shellContext.cwd.get().toFile());
                    Process process = builder.start();
                    Thread out = new Thread(new StreamGobbler(process.getInputStream(), shellContext.writer));