assertThat(unordered.toString()).contains("chicken");
    assertThat(unordered.toString()).contains("egg");
  }

  @Test
  public void testSelfLoop() {
    EndpointPair<String> unordered = EndpointPair.unordered("node", "node");
    assertThat(unordered.isOrdered()).isFalse();
    assertThat(unordered).containsExactly("node", "node");