private void doIdempotentOperationsTest(TestingUri uri) {
    EmbeddedChannel channel = createEmbeddedChannel();
    // no exceptions.
    channel.writeInbound(RestTestUtils.createRequest(HttpMethod.GET, uri.toString(), null));
    HttpResponse response = (HttpResponse) channel.readOutbound();
    assertEquals("Unexpected response status", HttpResponseStatus.OK, response.status());
  }
Checks that idempotent operations do not throw exceptions when called multiple times. Does <b><i>not</i></b>
currently test that state changes are idempotent.
@param uri the uri to be hit.
ambry-rest/src/test/java/com/github/ambry/rest/NettyResponseChannelTest.java