private List<VFileEvent> getEvents(String msg, @Nullable Runnable action) {
    LOG.debug("** waiting for " + msg);
    myAccept = true;

    if (action != null) {
      action.run();
    }

    int timeout = myTimeout;
    try {
      synchronized (myWaiter) {
        //noinspection WaitNotInLoop
        myWaiter.wait(timeout);
      }
    } catch (InterruptedException e) {
      LOG.warn(e);
    }

    LOG.debug("** waited for " + timeout);
    myFileSystem.refresh(false);

    ArrayList<VFileEvent> result;
    synchronized (myEvents) {
      result = new ArrayList<VFileEvent>(myEvents);
      myEvents.clear();
    }
    LOG.debug("** events: " + result.size());
    return result;
  }
  public void testSubst() throws Exception {
    if (!SystemInfo.isWindows) {
      System.err.println("Ignored: Windows required");
      return;
    }

    File targetDir = createTestDir("top");
    File subDir = createTestDir(targetDir, "sub");
    File file = createTestFile(subDir, "test.txt");
    File rootFile = createSubst(targetDir.getAbsolutePath());
    VirtualDirectoryImpl.allowRootAccess(rootFile.getPath());
    VirtualFile vfsRoot = myFileSystem.findFileByIoFile(rootFile);

    try {
      assertNotNull(rootFile.getPath(), vfsRoot);
      File substDir = new File(rootFile, subDir.getName());
      File substFile = new File(substDir, file.getName());
      refresh(targetDir);
      refresh(substDir);

      LocalFileSystem.WatchRequest request = watch(substDir);
      try {
        myAccept = true;
        FileUtil.writeToFile(file, "new content");
        assertEvent(VFileContentChangeEvent.class, substFile.getAbsolutePath());

        LocalFileSystem.WatchRequest request2 = watch(targetDir);
        try {
          myAccept = true;
          FileUtil.delete(file);
          assertEvent(VFileDeleteEvent.class, file.getAbsolutePath(), substFile.getAbsolutePath());
        } finally {
          unwatch(request2);
        }

        myAccept = true;
        FileUtil.writeToFile(file, "re-creation");
        assertEvent(VFileCreateEvent.class, substFile.getAbsolutePath());
      } finally {
        unwatch(request);
      }
    } finally {
      delete(targetDir);
      IoTestUtil.deleteSubst(rootFile.getPath());
      if (vfsRoot != null) {
        ((NewVirtualFile) vfsRoot).markDirty();
        myFileSystem.refresh(false);
      }
      VirtualDirectoryImpl.disallowRootAccess(rootFile.getPath());
    }
  }