hateos.java

    @Test
    public void testStartDeployedThing() throws Exception
    {
        // find the deployment url
        _Root root = http.prepareGet("http://localhost:25365/")
                         .setHeader("accept", MediaType.APPLICATION_JSON)
                         .execute(new JsonMappingAsyncHandler<_Root>(_Root.class)).get();
        _Action deploy = Iterables.find(root._actions, fieldEquals("rel", "deploy"));

        // perform a deployment against it
        _DeployedSlot c = http.preparePost(deploy.uri)
                              .setHeader("content-type", MediaType.APPLICATION_JSON)
                              .setBody(mapper.writeValueAsString(new _Deploy()))
                              .execute(new JsonMappingAsyncHandler<_DeployedSlot>(_DeployedSlot.class))
                              .get();

        // start the deployed thing
        _Action start = Iterables.find(c._actions, fieldEquals("rel", "start"));
        assertThat(start.method, equalTo("POST"));
        assertThat(start.params, equalTo(Collections.<String, String>emptyMap()));

        Response start_response = http.preparePost(start.uri)
                                      .execute()
                                      .get();

        // http client does not follow redirects correctly, so we
        // need to hardcode following the see other :-(
        assertThat(start_response.getStatusCode(), isHttpRedirect());
        String slot_uri = start_response.getHeader("location");

        // check to make sure the deployed thing is now running
        _DeployedSlot started = http.prepareGet(slot_uri)
                                    .setHeader("accept", MediaType.APPLICATION_JSON)
                                    .execute(new JsonMappingAsyncHandler<_DeployedSlot>(_DeployedSlot.class))
                                    .get();
        assertThat(started.slot.running, equalTo(true));
    }

Nice, very readable. Have you thought of how to add abstractions for retries, or generalized error handling?