public void testFindRoot() throws IOException {
    VirtualFile root = LocalFileSystem.getInstance().findFileByPath("wrong_path");
    assertNull(root);

    VirtualFile root2;
    if (SystemInfo.isWindows) {
      root = LocalFileSystem.getInstance().findFileByPath("\\\\unit-133");
      assertNotNull(root);
      root2 = LocalFileSystem.getInstance().findFileByPath("//UNIT-133");
      assertNotNull(root2);
      assertEquals(String.valueOf(root2), root, root2);
      RefreshQueue.getInstance().processSingleEvent(new VFileDeleteEvent(this, root, false));

      root = LocalFileSystem.getInstance().findFileByIoFile(new File("\\\\unit-133"));
      assertNotNull(root);
      RefreshQueue.getInstance().processSingleEvent(new VFileDeleteEvent(this, root, false));

      if (new File("c:").exists()) {
        root = LocalFileSystem.getInstance().findFileByPath("c:");
        assertNotNull(root);
        assertEquals("C:/", root.getPath());

        root2 = LocalFileSystem.getInstance().findFileByPath("C:\\");
        assertEquals(String.valueOf(root2), root, root2);
      }
    } else if (SystemInfo.isUnix) {
      root = LocalFileSystem.getInstance().findFileByPath("/");
      assertNotNull(root);
      assertEquals(root.getPath(), "/");
    }

    root = LocalFileSystem.getInstance().findFileByPath("");
    assertNotNull(root);

    File jarFile = IoTestUtil.createTestJar();
    root = VirtualFileManager.getInstance().findFileByUrl("jar://" + jarFile.getPath() + "!/");
    assertNotNull(root);

    root2 =
        VirtualFileManager.getInstance()
            .findFileByUrl("jar://" + jarFile.getPath().replace(File.separator, "//") + "!/");
    assertEquals(String.valueOf(root2), root, root2);

    if (!SystemInfo.isFileSystemCaseSensitive) {
      root2 =
          VirtualFileManager.getInstance()
              .findFileByUrl("jar://" + jarFile.getPath().toUpperCase(Locale.US) + "!/");
      assertEquals(String.valueOf(root2), root, root2);
    }
  }
 @Override
 public void launch() {
   mySemaphore.down();
   ((RefreshQueueImpl) RefreshQueue.getInstance()).execute(this);
 }