@Test
  public void idempotentOperationsTest() {
    doIdempotentOperationsTest(TestingUri.MultipleClose);
    doIdempotentOperationsTest(TestingUri.MultipleOnResponseComplete);
  }
Tests that no exceptions are thrown on repeating idempotent operations. Does <b><i>not</i></b> currently test that
state changes are idempotent.
ambry-rest/src/test/java/com/github/ambry/rest/NettyResponseChannelTest.java