return null;
            }

            @Override
            public InputStream openStream() throws IOException {
                return new ByteArrayInputStream(buffer.toString().getBytes(StandardCharsets.UTF_8));
            }

            @Override
            public String getLocation() {
                return artifact.getId();
            }

            @Override

            writer.write(artifact.getId());
        }

        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(artifact.getId().getBytes());
        byte[] digest = md.digest();

        String md5path = repository.pathOf(artifact) + ".md5";
        File md5artifactFile = new File(repository.getBasedir(), md5path);
        try (Writer writer =

        if (content != null) {
            resource.setContentLength(content.length());
            resource.setLastModified(System.currentTimeMillis());

            inputData.setInputStream(new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_8)));
        } else {
            throw new ResourceDoesNotExistException("No content provided for " + resource.getName());
        }
    }

    @Override

                "<packaging>pom</packaging>",
                "<packaging>pom</packaging><properties><addedProperty>addedValue</addedProperty></properties>");
        Files.write(parent.toPath(), parentContent.getBytes(StandardCharsets.UTF_8));
        // re-build pom with modified parent
        ProjectBuildingResult result = projectBuilder.build(child, configuration);

                throw new RuntimeException(e);
            }
            return false;
        }
    }

    @Override
    public Optional<byte[]> getBytes(URI relativeSource) {
        try {
            Path tempPath = null;
            try {
                tempPath = Files.createTempFile("transport-get", "tmp");
                if (get(relativeSource, tempPath)) {

        this.hashCode = this.content.hashCode();
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_8));
    }

    @Override
    public String getLocation() {
        return location;
    }

    /**
     * Gets the content of this source.
     *

    }

    @AfterEach
    void tearDown() throws Exception {
        builder = null;
    }

    private InputStream toStream(String xml) {
        return new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8));
    }

    @Test
    void testEmptyDescriptor() throws Exception {
        String xml = "<extension></extension>";

        ExtensionDescriptor ed = builder.build(toStream(xml));

                File temp = File.createTempFile("maven-artifact", null);
                temp.deleteOnExit();
                byte[] bytes = sums.get(extension).getBytes(StandardCharsets.UTF_8);
                Files.write(
                        Paths.get(temp.getAbsolutePath()), bytes, StandardOpenOption.APPEND, StandardOpenOption.CREATE);

                temporaryFiles.add(temp);

    }

    @Test
    void calculateByte() throws IOException {
        Map<ChecksumAlgorithmService.ChecksumAlgorithm, String> checksums = service.calculate(
                "test".getBytes(StandardCharsets.UTF_8), service.select(Arrays.asList("SHA-1", "MD5")));
        assertNotNull(checksums);
        assertEquals(2, checksums.size());

                throw new RuntimeException(e);
            }
            return false;
        }
    }

    @Override
    public Optional<byte[]> getBytes(URI relativeSource) {
        try {
            Path tempPath = null;
            try {
                tempPath = Files.createTempFile("transport-get", "tmp");
                if (get(relativeSource, tempPath)) {