@Test
public void testContainerId() throws URISyntaxException {

  ContainerId id = TestContainerId.newContainerId(0, 0, 0, 0);
  String cid = id.toString();
  assertEquals("container_0_0000_00_000000", cid);
  ContainerId gen = ContainerId.fromString(cid);
  assertEquals(gen, id);
}