* most [BufferedSource] instances, but not of [Buffer].
   */
  private fun responseBody(content: String): ResponseBody {
    val data = Buffer().writeUtf8(content)
    val source: Source =
      object : Source {
        var closed = false

        override fun close() {
          closed = true
        }

        override fun read(
          sink: Buffer,
          byteCount: Long,

	Text() string
	// File reports the source file name of the token.
	File() string
	// Base reports the position base of the token.
	Base() *src.PosBase
	// SetBase sets the position base.
	SetBase(*src.PosBase)
	// Line reports the source line number of the token.
	Line() int
	// Col reports the source column number of the token.
	Col() int
	// Close does any teardown required.
	Close()

        problem = new DefaultProblem(null, null, "SOURCE", -1, -1, null);
        assertEquals("SOURCE", problem.getSource());
    }

    @Test
    void testGetLocation() {
        DefaultProblem problem = new DefaultProblem(null, null, null, -1, -1, null);
        assertEquals("", problem.getLocation());

        problem = new DefaultProblem(null, null, "SOURCE", -1, -1, null);

        try {
            final RESULT result = entityType.newInstance();
            result.setElevateWordId(DfTypeUtil.toString(source.get("elevateWordId")));
            result.setLabelTypeId(DfTypeUtil.toString(source.get("labelTypeId")));
            return updateEntity(source, result);

    protected <RESULT extends Group> RESULT createEntity(Map<String, Object> source, Class<? extends RESULT> entityType) {
        try {
            final RESULT result = entityType.newInstance();
            result.setGidNumber(DfTypeUtil.toLong(source.get("gidNumber")));
            result.setName(DfTypeUtil.toString(source.get("name")));
            return updateEntity(source, result);
        } catch (InstantiationException | IllegalAccessException e) {

     */
    int getColumnNumber();

    /**
     * Return the byte or character offset into the input source this location
     * is pointing to. If the input source is a file or a byte stream then
     * this is the byte offset into that stream, but if the input source is
     * a character media then the offset is the character offset.
     * Returns -1 if there is no offset available.

     * @param buffer source buffer
     * @param bufferIndex starting index in source buffer
     * @param len length of data to read
     * @return number of bytes read
     */
    protected abstract int readSetupWireFormat(byte[] buffer, int bufferIndex, int len);

    /**
     * Reads parameters from wire format
     * @param buffer source buffer

     */
    @Nonnull
    default SettingsBuilderResult build(
            @Nonnull Session session,
            @Nonnull Source installationSettingsSource,
            @Nonnull Source projectSettingsSource,
            @Nonnull Source userSettingsSource) {
        return build(SettingsBuilderRequest.build(
                session, installationSettingsSource, projectSettingsSource, userSettingsSource));
    }

            Set<Artifact> artifacts,
            Artifact originatingArtifact,
            Map<String, Artifact> managedVersions,
            ArtifactResolutionRequest repositoryRequest,
            ArtifactMetadataSource source,
            ArtifactFilter filter,
            List<ResolutionListener> listeners,
            List<ConflictResolver> conflictResolvers);

    ArtifactResolutionResult collect(
            Set<Artifact> artifacts,

    //
    void putArtifact(
            File source, Artifact artifact, ArtifactRepository deploymentRepository, TransferListener downloadMonitor)
            throws TransferFailedException;

    void putRemoteFile(ArtifactRepository repository, File source, String remotePath, TransferListener downloadMonitor)
            throws TransferFailedException;