private static void checkAllowsInsecure(Path path, RecursiveDeleteOption[] options)
      throws InsecureRecursiveDeleteException {
    if (!Arrays.asList(options).contains(RecursiveDeleteOption.ALLOW_INSECURE)) {
      throw new InsecureRecursiveDeleteException(path.toString());
    }
  }

  /**
   * Adds the given exception to the given collection, creating the collection if it's null. Returns

      try (FileSystem fs = newTestFileSystem()) {
        Path dir = fs.getPath("dir");
        assertEquals(6, MoreFiles.listFiles(dir).size());

        assertThrows(InsecureRecursiveDeleteException.class, () -> method.delete(dir));

        assertTrue(Files.exists(dir));
        assertEquals(6, MoreFiles.listFiles(dir).size());
      }
    }
  }

      try (FileSystem fs = newTestFileSystem()) {
        Path dir = fs.getPath("dir");
        assertEquals(6, MoreFiles.listFiles(dir).size());

        assertThrows(InsecureRecursiveDeleteException.class, () -> method.delete(dir));

        assertTrue(Files.exists(dir));
        assertEquals(6, MoreFiles.listFiles(dir).size());
      }
    }
  }