/**
   * Starts the local node and checks for presence of log file. Also checks that this is really a
   * log of a started node.
   *
   * @param id Test-local node ID.
   * @throws Exception If error occurred.
   */
  private void checkOneNode(int id) throws Exception {
    try (Grid grid = G.start(getConfiguration("grid" + id))) {
      String id8 = U.id8(grid.localNode().id());
      String logPath = "work/log/gridgain-" + id8 + ".log";
      File logFile = U.resolveGridGainPath(logPath);

      assertNotNull("Failed to resolve path: " + logPath, logFile);
      assertTrue("Log file does not exist: " + logFile, logFile.exists());

      String logContent = U.readFileToString(logFile.getAbsolutePath(), "UTF-8");

      assertTrue(
          "Log file does not contain it's node ID: " + logFile,
          logContent.contains(">>> Local node [ID=" + id8.toUpperCase()));
    }
  }
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  /**
   * Starts new grid node.
   *
   * @param gridName name of new node.
   * @param springCfg file with spring configuration to use for this node.
   * @return a grid instance local to new node {@link GridGain#start(GridConfiguration)}.
   * @throws Exception if node run failed.
   */
  protected Grid startNode(String gridName, File springCfg) throws Exception {
    assert springCfg != null;

    ListableBeanFactory springCtx =
        new FileSystemXmlApplicationContext("file:///" + springCfg.getAbsolutePath());

    Map cfgMap = springCtx.getBeansOfType(GridConfiguration.class);

    assert cfgMap != null;
    assert !cfgMap.isEmpty();

    GridConfiguration cfg = (GridConfiguration) cfgMap.values().iterator().next();

    cfg.setGridName(gridName + "-" + getNextNodeNum());

    return G.start(cfg);
  }