@Override
  public List<String> getList(PropertyKey key) {
    checkArgument(key.getType() == PropertyKey.PropertyType.LIST);
    String value = (String) get(key);
    return ConfigurationUtils.parseAsList(value, key.getDelimiter());
  }
@Test
  public void getList() {
    mConfiguration.set(PropertyKey.WORKER_PAGE_STORE_DIRS, Lists.newArrayList("/a", "/b", "/c"));
    assertEquals(
        Lists.newArrayList("/a", "/b", "/c"),
        mConfiguration.getList(PropertyKey.WORKER_PAGE_STORE_DIRS));
  }