@Test
  public void testWriteLinkNode() throws JSONException, RepositoryException, IOException {
    Session session = mock(Session.class);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    Writer w = new PrintWriter(baos);
    JSONWriter write = new JSONWriter(w);
    SiteService siteService = mock(SiteService.class);

    Node node = new MockNode("/path/to/link");
    node.setProperty(FilesConstants.SAKAI_LINK, "uuid");
    node.setProperty("foo", "bar");
    Node fileNode = createFileNode();
    when(session.getNodeByIdentifier("uuid")).thenReturn(fileNode);

    FileUtils.writeLinkNode(node, session, write, siteService);
    w.flush();
    String s = baos.toString("UTF-8");
    JSONObject j = new JSONObject(s);

    assertEquals("/path/to/link", j.getString("jcr:path"));
    assertEquals("bar", j.getString("foo"));
    assertFileNodeInfo(j.getJSONObject("file"));
  }